Enhanced physical downlink control channel transmission method and apparatus

ABSTRACT

This application provides an enhanced physical downlink control channel transmission method and apparatus. The method includes: in a physical resource block set, separately arranging first resource groups in each physical resource block pair PRB pair, where the first resource groups are resource element groups eREGs or REGs, and the physical resource block set includes at least one of the physical resource block pairs; numbering second resource groups according to a correspondence between the first resource groups and the second resource groups in the physical resource block set, where the second resource groups are control channel element eCCE groups or control channel candidates; determining numbers of the second resource groups for transmitting an E-PDCCH; and mapping, according to the determined numbers, the E-PDCCH to the corresponding first resource groups for transmission. The technical solution of this application resolves an E-PDCCH transmission problem.

CROSS-REFERENCE TO RELATED APPLICATION

This application a continuation of International Patent Application No.PCT/CN2012/082363, filed on Sep. 28, 2012, which claims priority toInternational Patent Application No. PCT/CN2012/079598, filed on Aug. 2,2012, both of which are hereby incorporated by reference in theirentireties.

TECHNICAL FIELD

The present invention relates to communications technologies, and inparticular, to an enhanced physical downlink control channeltransmission method and apparatus.

BACKGROUND

In LTE release (Release) Aug. 9, 2010, a physical downlink controlchannel (PDCCH) is transmitted on first N (N=1, 2, 3, 4) orthogonalfrequency division multiplexing (OFDM) symbols of each subframe, and ismultiplexed with a physical downlink shared channel (PDSCH) intime-division multiplexing (TDM) mode, and its demodulation pilot is adownlink common pilot, namely, a cell-specific reference signal (CRS).To ensure transmission reliability, a space frequency block code (SFBC)transmission mode or a combination of an SFBC transmission mode and afrequency switched transmit diversity (FSTD) transmission mode is used.

As a heterogeneous network is deployed on a large scale, in LTE release11, the PDCCH faces great challenges in aspects of capacity, coverage,and interference coordination, and therefore an enhanced PDCCH (E-PDCCH)is put forward. The E-PDCCH is located in a PDSCH region, andmultiplexed with the PDSCH in frequency division multiplexing (FDM)mode. In addition, multiplexing of an enhanced control channel and atraffic channel in a time-frequency resource block is not supported. TheE-PDCCH is demodulated based on a user equipment (UE) specificdemodulation reference signal (DMRS). As may be seen above,time-frequency resources occupied by the E-PDCCH are different fromthose occupied by the PDCCH in the prior art, and a PDCCH transmissionmode cannot be directly used to transmit the E-PDCCH. Therefore, anE-PDCCH transmission problem needs to be resolved.

SUMMARY

Embodiments of the present invention provide an enhanced physicaldownlink control channel transmission method and apparatus to resolve anE-PDCCH transmission problem.

A first aspect of an embodiment of the present invention provides anenhanced physical downlink control channel transmission method,including: in a physical resource block set, separately arranging firstresource groups in each physical resource block pair PRB pair, where thefirst resource groups are resource element groups eREGs or REGs, and thephysical resource block set includes at least one of the physicalresource block pairs; numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set, where the second resourcegroups are control channel element eCCE groups or control channelcandidates; determining numbers of the second resource groups fortransmitting an E-PDCCH; and mapping, according to the determinednumbers, the E-PDCCH to the corresponding first resource groups fortransmission.

In any one optional implementation manner of the foregoing method, eachof the physical resource block pairs includes N third resource groups,where N is a positive integer, and each of the third resource groupsincludes M first resource groups, and in the physical resource blockset, a number set of first resource groups included in each thirdresource group in a physical resource block pair is the same as a numberset of first resource groups included in a third resource group in eachof other physical resource block pairs; and the numbering secondresource groups according to a correspondence between the first resourcegroups and the second resource groups in the physical resource blockset, includes that: each of the third resource groups corresponds to oneof second resource groups of a first type, and the second resourcegroups of the first type in each physical resource block pair arenumbered sequentially in ascending or descending order of numbers of thephysical resource block pairs, where a correspondence between numbers ofthe second resource groups of the first type and numbers of firstresource groups corresponding to the second resource groups of the firsttype exists in each physical resource block pair.

In any one optional implementation manner of the foregoing method, thata correspondence between numbers of the second resource groups of thefirst type and numbers of first resource groups corresponding to thesecond resource groups of the first type exists in each physicalresource block pair includes that:

in each physical resource block pair, the numbers of the second resourcegroups of the first type are consecutive, and a sequence of the numbersof the second resource groups of the first type is the same as asequence of maximum numbers or minimum numbers of the first resourcegroups corresponding to the second resource groups of the first type.

In any one optional implementation manner of the foregoing method, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set includes:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, eachof the physical resource block pairs includes N third resource groups,where N is a positive integer, and each of the third resource groupsincludes M first resource groups; in the physical resource block set, anumber set of first resource groups included in each third resourcegroup in a physical resource block pair is the same as a number set offirst resource groups included in a third resource group in each ofother physical resource block pairs; in each of the physical resourceblock pairs, a sequence of numbers of the third resource groups is thesame as a sequence of maximum numbers or minimum numbers of the firstresource groups in the third resource groups; and the numbering secondresource groups according to a correspondence between the first resourcegroups and the second resource groups in the physical resource block setincludes that: each of the third resource groups corresponds to one ofsecond resource groups of a first type, and the second resource groupsof the first type corresponding to third resource groups having a samenumber are numbered sequentially in ascending or descending order of thenumbers of the third resource groups, where a correspondence between asequence of numbers of the second resource groups of the first type anda sequence of numbers of physical resource block pairs in which thesecond resource groups of the first type are located, exists in thesecond resource groups of the first type corresponding to the thirdresource groups having the same number.

In any one optional implementation manner of the foregoing method, thata correspondence between a sequence of numbers of the second resourcegroups of the first type and a sequence of numbers of physical resourceblock pairs in which the second resource groups of the first type arelocated, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number,includes that:

in the second resource groups of the first type corresponding to thethird resource groups having the same number, the numbers of the secondresource groups of the first type are consecutive, and the sequence ofthe numbers of the second resource groups of the first type is the sameas the sequence of the numbers of the physical resource block pairs inwhich the second resource groups of the first type are located.

In any one optional implementation manner of the foregoing method, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set includes:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, forthe second resource groups of the first type corresponding to the thirdresource groups having the same number, a mapping relationship betweenthe second resource groups of the first type in a physical resourceblock pair and first resource groups included in the second resourcegroups of the first type in the physical resource block pair is a cyclicshift of a mapping relationship between one of the second resourcegroups of the first type in each of the other physical resource blockpairs and first resource groups included in the one of the secondresource groups of the first type in each of the other physical resourceblock pairs.

In any one optional implementation manner of the foregoing method, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set includes that:

the second resource groups of a second type include M first resourcegroups that respectively belong to different physical resource blockpairs; and

numbers of first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type are usedas numbers of the second resource groups of the second type.

In any one optional implementation manner of the foregoing method, thenumbering second resource groups according to a correspondence betweenthe first resource groups and second resource groups in the physicalresource block set includes:

determining the numbers of the second resource groups of the second typeaccording to the following formula:j=(i−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

determining the numbers of the second resource groups of the second typeaccording to the following formula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

In any one optional implementation manner of the foregoing method, thenumbering second resource groups according to a correspondence betweenthe first resource groups and second resource groups in the physicalresource block set includes that:

the second resource groups of a second type include M first resourcegroups that respectively belong to different physical resource blockpairs, and the physical resource block set includes K sets of the secondresource groups of the second type, where K is a positive integer, andin each set of the K sets, a mapping relationship between one of thesecond resource groups of the second type and first resource groupsincluded in the one of the second resource groups of the second type isa cyclic shift of a mapping relationship between each of other secondresource groups of the second type and first resource groups included ineach of the other second resource groups of the second type;

in each set of the K sets, the second resource groups of the second typeare numbered according to numbers of first resource groups in a samephysical resource block pair corresponding to the second resource groupsof the second type; and

between different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same physicalresource block pair.

In any one optional implementation manner of the foregoing method, thephysical resource block set includes K sets of the second resourcegroups of the second type, and in each set of the K sets, a mappingrelationship between one of the second resource groups of the secondtype and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type.

In any one optional implementation manner of the foregoing method, iffirst resource groups corresponding to at least two of the secondresource groups of the first type in the physical resource block set arethe same as first resource groups corresponding to at least two of thesecond resource groups of the second type in the physical resource blockset, a set of numbers of the at least two of the second resource groupsof the first type is the same as a set of numbers of the at least two ofthe second resource groups of the second type.

In any one optional implementation manner of the foregoing method, thesecond resource groups of the first type in the physical resource blockset are resource groups for transmitting the E-PDCCH in localized mode;and the second resource groups of the second type in the physicalresource block set are resource groups for transmitting the E-PDCCH indistributed mode.

A second aspect of an embodiment of the present invention provides anenhanced physical downlink control channel E-PDCCH transmissionapparatus, including:

an arranging unit, configured to separately arrange, in a physicalresource block set, first resource groups in each physical resourceblock pair PRB pair, where the first resource groups are resourceelement groups eREGs or REGs, and the physical resource block setincludes at least one of the physical resource block pairs;

a numbering unit, configured to number second resource groups accordingto a correspondence between the first resource groups and the secondresource groups in the physical resource block set, where the secondresource groups are control channel element eCCE groups or controlchannel candidates;

a fifth determining unit, configured to determine numbers of the secondresource groups for transmitting an E-PDCCH; and

a transmission unit, configured to map, according to the determinednumbers, the E-PDCCH to the corresponding first resource groups fortransmission.

In any one optional implementation manner of the foregoing apparatus,each of the physical resource block pairs includes N third resourcegroups, where N is a positive integer, and each of the third resourcegroups includes M first resource groups, and in the physical resourceblock set, a number set of first resource groups included in each thirdresource group in a physical resource block pair is the same as a numberset of first resource groups included in a third resource group in eachof other physical resource block pairs, and each of the third resourcegroups corresponds to one of second resource groups of a first type; andthe numbering unit is configured to sequentially number the secondresource groups of the first type in each physical resource block pairin ascending or descending order of numbers of the physical resourceblock pairs, where a correspondence between numbers of the secondresource groups of the first type and numbers of first resource groupscorresponding to the second resource groups of the first type exists ineach physical resource block pair.

In any one optional implementation manner of the foregoing method, thata correspondence between numbers of the second resource groups of thefirst type and numbers of first resource groups corresponding to thesecond resource groups of the first type exists in each physicalresource block pair includes that: in each physical resource block pair,the numbers of the second resource groups of the first type areconsecutive, and a sequence of the numbers of the second resource groupsof the first type is the same as a sequence of maximum numbers orminimum numbers of the first resource groups corresponding to the secondresource groups of the first type.

In any one optional implementation manner of the foregoing method, thenumbering unit is configured to determine the numbers of the secondresource groups of the first type according to the following formula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, eachof the physical resource block pairs includes N third resource groups,where N is a positive integer, and each of the third resource groupsincludes M first resource groups; in the physical resource block set, anumber set of first resource groups included in each third resourcegroup in a physical resource block pair is the same as a number set offirst resource groups included in a third resource group in each ofother physical resource block pairs; in each of the physical resourceblock pairs, a sequence of numbers of the third resource groups is thesame as a sequence of maximum numbers or minimum numbers of the firstresource groups in the third resource groups; each of the third resourcegroups corresponds to one of second resource groups of a first type; andthe numbering unit is configured to sequentially number the secondresource groups of the first type corresponding to third resource groupshaving a same number in ascending or descending order of the numbers ofthe third resource groups, where a correspondence between a sequence ofnumbers of the second resource groups of the first type and a sequenceof numbers of physical resource block pairs in which the second resourcegroups of the first type are located, exists in the second resourcegroups of the first type corresponding to the third resource groupshaving the same number.

In any one optional implementation manner of the foregoing method, thata correspondence between a sequence of numbers of the second resourcegroups of the first type and a sequence of numbers of physical resourceblock pairs in which the second resource groups of the first type arelocated, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number,includes that:

in the second resource groups of the first type corresponding to thethird resource groups having the same number, the numbers of the secondresource groups of the first type are consecutive, and the sequence ofthe numbers of the second resource groups of the first type is the sameas the sequence of the numbers of the physical resource block pairs inwhich the second resource groups of the first type are located.

In any one optional implementation manner of the foregoing method, thenumbering unit is configured to determine the numbers of the secondresource groups of the first type according to the following formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, forthe second resource groups of the first type corresponding to the thirdresource groups having the same number, a mapping relationship betweenthe second resource groups of the first type in a physical resourceblock pair and first resource groups included in the second resourcegroups of the first type in the physical resource block pair is a cyclicshift of a mapping relationship between one of the second resourcegroups of the first type in each of the other physical resource blockpairs and first resource groups included in the one of the secondresource groups of the first type in each of the other physical resourceblock pairs.

In any one optional implementation manner of the foregoing method, thesecond resource groups of a second type include M first resource groupsthat respectively belong to different physical resource block pairs; and

the numbering unit is configured to use numbers of first resource groupsin a same physical resource block pair corresponding to the secondresource groups of the second type as numbers of the second resourcegroups of the second type.

In any one optional implementation manner of the foregoing method, thenumbering unit is configured to determine the numbers of the secondresource groups of the second type according to the following formula:J=(i−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

the numbering unit is configured to determine the numbers of the secondresource groups of the second type according to the following formula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

In any one optional implementation manner of the foregoing method, thesecond resource groups of a second type include M first resource groupsthat respectively belong to different physical resource block pairs, andthe physical resource block set includes K sets of the second resourcegroups of the second type, where K is a positive integer, and in eachset of the K sets, a mapping relationship between one of the secondresource groups of the second type and first resource groups included inthe one of the second resource groups of the second type is a cyclicshift of a mapping relationship between each of other second resourcegroups of the second type and first resource groups included in each ofthe other second resource groups of the second type; the numbering unitis configured to number, in each set of the K sets, the second resourcegroups of the second type according to numbers of first resource groupsin a same physical resource block pair corresponding to the secondresource groups of the second type; and between different sets of the Ksets, a sequence of numbers of the second resource groups of the secondtype is the same as a sequence of maximum numbers or minimum numbers offirst resource groups corresponding to the different sets in the K setsin a same physical resource block pair.

In any one optional implementation manner of the foregoing method, thephysical resource set includes K sets of the second resource groups ofthe second type, and in each set of the K sets, a mapping relationshipbetween one of the second resource groups of the second type and firstresource groups included in the one of the second resource groups of thesecond type is a cyclic shift of a mapping relationship between each ofother second resource groups of the second type and first resourcegroups included in each of the other second resource groups of thesecond type.

In any one optional implementation manner of the foregoing method, iffirst resource groups corresponding to at least two of the secondresource groups of the first type in the physical resource block set arethe same as first resource groups corresponding to at least two of thesecond resource groups of the second type in the physical resource blockset, a set of numbers of the at least two of the second resource groupsof the first type is the same as a set of numbers of the at least two ofthe second resource groups of the second type.

In any one optional implementation manner of the foregoing method, thesecond resource groups of the first type in the physical resource blockset are resource groups for transmitting the E-PDCCH in localized mode;and the second resource groups of the second type in the physicalresource block set are resource groups for transmitting the E-PDCCH indistributed mode.

A third aspect of an embodiment of the present invention provides anenhanced physical downlink control channel E-PDCCH transmissionapparatus, including:

a transceiver, configured to transmit and receive a signal; and

a processor, configured to execute the following steps:

in a physical resource block set, separately arranging first resourcegroups in each physical resource block pair PRB pair, where the firstresource groups are resource element groups eREGs or REGs, and thephysical resource block set includes at least one of the physicalresource block pairs;

numbering second resource groups according to a correspondence betweenthe first resource groups and second resource groups in the physicalresource block set, where the second resource groups are control channelelement eCCE groups or control channel candidates;

determining numbers of the second resource groups for transmitting anE-PDCCH; and

mapping, according to the determined numbers, the E-PDCCH to thecorresponding first resource groups for transmission.

In any one optional implementation manner of the foregoing method, eachof the physical resource block pairs includes N third resource groups,where N is a positive integer, and each of the third resource groupsincludes M first resource groups, and in the physical resource blockset, a number set of first resource groups included in each thirdresource group in a physical resource block pair is the same as a numberset of first resource groups included in a third resource group in eachof other physical resource block pairs; and

the processor is configured to implement, in the following manner, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set: each of the third resource groups corresponds to oneof second resource groups of a first type, and the second resourcegroups of the first type in each physical resource block pair arenumbered sequentially in ascending or descending order of numbers of thephysical resource block pairs, where a correspondence between numbers ofthe second resource groups of the first type and numbers of firstresource groups corresponding to the second resource groups of the firsttype exists in each physical resource block pair.

In any one optional implementation manner of the foregoing method, thata correspondence between numbers of the second resource groups of thefirst type and numbers of first resource groups corresponding to thesecond resource groups of the first type exists in each physicalresource block pair includes that:

in each physical resource block pair, the numbers of the second resourcegroups of the first type are consecutive, and a sequence of the numbersof the second resource groups of the first type is the same as asequence of maximum numbers or minimum numbers of the first resourcegroups corresponding to the second resource groups of the first type.

In any one optional implementation manner of the foregoing method, theprocessor is configured to implement, in the following manner, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, eachof the physical resource block pairs includes N third resource groups,where N is a positive integer, and each of the third resource groupsincludes M first resource groups; in the physical resource block set, anumber set of first resource groups included in each third resourcegroup in a physical resource block pair is the same as a number set offirst resource groups included in a third resource group in each ofother physical resource block pairs; in each of the physical resourceblock pairs, a sequence of numbers of the third resource groups is thesame as a sequence of maximum numbers or minimum numbers of the firstresource groups in the third resource groups; and the processor isconfigured to implement, in the following manner, the numbering secondresource groups according to a correspondence between the first resourcegroups and the second resource groups in the physical resource blockset: each of the third resource groups corresponds to one of secondresource groups of a first type, and the second resource groups of thefirst type corresponding to third resource groups having a same numberare numbered sequentially in ascending or descending order of thenumbers of the third resource groups, where a correspondence between asequence of numbers of the second resource groups of the first type anda sequence of numbers of physical resource block pairs in which thesecond resource groups of the first type are located, exists in thesecond resource groups of the first type corresponding to the thirdresource groups having the same number.

In any one optional implementation manner of the foregoing method, thata correspondence between a sequence of numbers of the second resourcegroups of the first type and a sequence of numbers of physical resourceblock pairs in which the second resource groups of the first type arelocated, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number,includes that:

in the second resource groups of the first type corresponding to thethird resource groups having the same number, the numbers of the secondresource groups of the first type are consecutive, and the sequence ofthe numbers of the second resource groups of the first type is the sameas the sequence of the numbers of the physical resource block pairs inwhich the second resource groups of the first type are located.

In any one optional implementation manner of the foregoing method, theprocessor is configured to implement, in the following manner, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

In any one optional implementation manner of the foregoing method, forthe second resource groups of the first type corresponding to the thirdresource groups having the same number, a mapping relationship betweenthe second resource groups of the first type in a physical resourceblock pair and first resource groups included in the second resourcegroups of the first type in the physical resource block pair is a cyclicshift of a mapping relationship between one of the second resourcegroups of the first type in each of the other physical resource blockpairs and first resource groups included in the one of the secondresource groups of the first type in each of the other physical resourceblock pairs.

In any one optional implementation manner of the foregoing method, theprocessor is configured to implement, in the following manner, thenumbering, the second resource groups according to a correspondencebetween the first resource groups and the second resource groups in thephysical resource block set:

the second resource groups of a second type include M first resourcegroups that respectively belong to different physical resource blockpairs; and

numbers of first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type are usedas numbers of the second resource groups of the second type.

In any one optional implementation manner of the foregoing method, theprocessor is configured to implement, in the following manner, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set:

determining the numbers of the second resource groups of the second typeaccording to the following formula:j=(i−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

determining the numbers of the second resource groups of the second typeaccording to the following formula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

In any one optional implementation manner of the foregoing method, theprocessor is configured to implement, in the following manner, thenumbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set:

the second resource groups of a second type include M first resourcegroups that respectively belong to different physical resource blockpairs, and the physical resource block set includes K sets of the secondresource groups of the second type, where K is a positive integer, andin each set of the K sets, a mapping relationship between one of thesecond resource groups of the second type and first resource groupsincluded in the one of the second resource groups of the second type isa cyclic shift of a mapping relationship between each of other secondresource groups of the second type and first resource groups included ineach of the other second resource groups of the second type;

in each set of the K sets, the second resource groups of the second typeare numbered according to numbers of first resource groups in a samephysical resource block pair corresponding to the second resource groupsof the second type; and

between different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same physicalresource block pair.

In any one optional implementation manner of the foregoing method, thephysical resource block set includes K sets of the second resourcegroups of the second type, and in each set of the K sets, a mappingrelationship between one of the second resource groups of the secondtype and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type.

In any one optional implementation manner of the foregoing method, iffirst resource groups corresponding to at least two of the secondresource groups of the first type in the physical resource block set arethe same as first resource groups corresponding to at least two of thesecond resource groups of the second type in the physical resource blockset, a set of numbers of the at least two of the second resource groupsof the first type is the same as a set of numbers of the at least two ofthe second resource groups of the second type.

In any one optional implementation manner of the foregoing method, thesecond resource groups of the first type in the physical resource blockset are resource groups for transmitting the E-PDCCH in localized mode;and the second resource groups of the second type in the physicalresource block set are resource groups for transmitting the E-PDCCH indistributed mode.

By using the enhanced physical downlink control channel transmissionmethod and apparatus provided by the embodiments of the presentinvention, numbers of second resource groups are determined according tothe relationship between the first resource groups and the secondresource groups; then, numbers of the second resource groups fortransmitting an E-PDCCH are determined; and the E-PDCCH is mapped tocorresponding first resource groups for transmission. Therefore, anE-PDCCH transmission problem is resolved, and in addition, a numberingmethod in the solution is advantageous for blind detection.

BRIEF DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the presentinvention more clearly, the following briefly introduces theaccompanying drawings required for describing the embodiments.Apparently, the accompanying drawings in the following description showsome embodiments of the present invention, and a person of ordinaryskill in the art may still derive other drawings from these accompanyingdrawings without creative efforts.

FIG. 1A is a flowchart of an E-PDCCH transmission method according to anembodiment of the present invention;

FIG. 1B is a flowchart of an E-PDCCH reception method according to anembodiment of the present invention;

FIG. 2A is a schematic structural diagram of a base station according toan embodiment of the present invention;

FIG. 2B is a schematic structural diagram of a UE according to anembodiment of the present invention;

FIG. 3A is a schematic structural diagram of a base station according toanother embodiment of the present invention;

FIG. 3B is a schematic structural diagram of a UE according to anotherembodiment of the present invention;

FIG. 4A is a flowchart of another E-PDCCH transmission method accordingto an embodiment of the present invention;

FIG. 4B to FIG. 4E are schematic diagrams of various numbering resultsaccording to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a transmission apparatusaccording to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a numbering apparatusaccording to another embodiment of the present invention;

FIG. 7A is a flowchart of a control channel detection method accordingto an embodiment of the present invention;

FIG. 7B and FIG. 7C are schematic diagrams of a first physical resourceblock set and a second physical resource block set according to anembodiment of the present invention;

FIG. 8 is a schematic structural diagram of a UE according to stillanother embodiment of the present invention; and

FIG. 9 is a schematic structural diagram of a base station according tostill another embodiment of the present invention.

FIG. 10 shows an optional correspondence between the second resourcegroups of the first type and second type and the first resource groupsand pilot ports on a basis of Table 1.

FIG. 11 shows another optional correspondence between the secondresource groups of the first type and second type and the first resourcegroups and the pilot ports on a basis of Table 2.

FIG. 12 shows a second resource group of the first type and a secondresource group of the second type may also include four first resourcegroups on a basis of Table 1.

FIG. 13 shows another mapping relationship between the first resourcegroups and the DMRS ports.

FIG. 14 shows another mapping relationship between physical resourceblock pairs and first resource groups.

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of theembodiments of the present invention clearer, the following clearlydescribes the technical solutions in the embodiments of the presentinvention with reference to the accompanying drawings in the embodimentsof the present invention. Apparently, the described embodiments are apart rather than all of the embodiments of the present invention. Allother embodiments obtained by a person of ordinary skill in the artbased on the embodiments of the present invention without creativeefforts shall fall within the protection scope of the present invention.

FIG. 1A is a flowchart of an E-PDCCH transmission method according to anembodiment of the present invention. This embodiment may be executed bya base station, for example, a base station in an LTE system. As shownin FIG. 1A, the method in this embodiment includes:

Step 101: Determine a correspondence between second resource groups of afirst type and first resource groups and pilot ports, and acorrespondence between second resource groups of a second type and firstresource groups and pilot ports according to a mapping relationshipbetween the first resource groups and the pilot ports and according to aspecific relationship.

The mapping relationship between the first resource groups and the pilotports is obtained by the base station in advance. A manner in which thebase station obtains the mapping relationship between the first resourcegroups and the pilot ports in advance includes but is not limited to thefollowing several manners: The base station and a user equipment (UE)predefine the mapping relationship between the first resource groups andthe pilot ports. Alternatively, the base station generates the mappingrelationship between the first resource groups and the pilot portsaccording to a local cell identity (ID). Optionally, the base stationmay further send higher layer signaling to the UE, where the higherlayer signaling includes the mapping relationship between the firstresource groups and the pilot ports.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport; and the physical resource element set is at least one physicalresource block pair (PRB pair). The first resource groups are resourceelement groups (eREGs) or REGs; the second resource groups of the firsttype are control channel elements (eCCEs) or control channel candidates;and the second resource groups of the second type are eCCEs or controlchannel candidates. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. Herein the correspondence mainly indicates that the secondresource groups of the first type and second type may include at leasttwo first resource groups. A correspondence between second resourcegroups of different types and the first resource groups and the pilotports satisfies the foregoing specific relationship. The pilot ports inthis embodiment mainly refer to DMRS ports.

As may be seen above, the second resource groups in this embodimentinclude two types: second resource groups of the first type and secondresource groups of the second type. Optionally, the second resourcegroups of the first type are resource groups for transmitting an E-PDCCHin localized mode, and the second resource groups of the second type areresource groups for transmitting the E-PDCCH in distributed mode. Hereinthe transmission in localized mode means that resources for transmittingthe E-PDCCH are allocated and centralized in one or several consecutivephysical resource block pairs, and the transmission in distributed modemeans that resources for transmitting the E-PDCCH are allocated anddecentralized in multiple non-consecutive physical resource block pairs.It is noted herein that in release 11, when the E-PDCCH is transmittedin distributed mode, SFBC is not supported, but a multi-user commonprecoding (random beam forming) mechanism is used.

If the first resource groups are eREGs, an optional mapping relationshipbetween the first resource groups and the pilot ports is shown in Table1.

TABLE 1 eREG position index (index) DMRS port (port) eREG (0) Port 7eREG (1) Port 9 eREG (2) Port 8 eREG (3) Port 10 eREG (4) Port 9 eREG(5) Port 7 eREG (6) Port 10 eREG (7) Port 8

As shown in Table 1, the physical resource element set is a physicalresource block pair, where the physical resource block pair includeseight eREGs, and the eight eREGs are mapped to four DMRS ports in total,which are a DMRS port 7, a DMRS port 8, a DMRS port 9, and a DMRS port10 respectively. A mapping relationship between each eREG and a DMRSport is not limited to that shown in Table 1.

On a basis of Table 1, an optional correspondence between the secondresource groups of the first type and second type and the first resourcegroups and pilot ports is shown in FIG. 10.

As shown in FIG. 10, the physical resource block set used fortransmitting the E-PDCCH includes four physical resource block pairs,which are physical resource block pairs indexed 1, 2, 3, and 4respectively, where each physical resource block pair includes eighteREGs. In each physical resource block pair, each eREG has a uniqueposition index (for example, numbers 0 to 7 in brackets after eREGs inTable 1 or FIG. 10). For physical resource block pairs including a samequantity of eREGs, the eREGs have same position indexes. A secondresource group of the first type includes at least two eREGs in a samephysical resource block pair. Assuming that a second resource group ofthe first type includes two eREGs in a same physical resource blockpair, the second resource group of the first type may include eREG (0)and eREG (1) in a physical resource block pair indexed 1 in FIG. 10, andcorresponding pilot ports are the DMRS ports 7 and 9; or the secondresource group of the first type includes eREG (2) and eREG (3) in aphysical resource block pair indexed 1, and corresponding pilot portsare the DMRS ports 8 and 10; or the second resource group of the firsttype includes eREG (4) and eREG (5) in a physical resource block pairindexed 1, and corresponding pilot ports are the DMRS ports 9 and 7; orthe second resource group of the first type includes eREG (6) and eREG(7) in a physical resource block pair indexed 1, and corresponding pilotports are the DMRS ports 10 and 8; or the second resource group of thefirst type may also include eREGs in a physical resource block pairindexed 2, and so on, which are not further listed. A second resourcegroup of the second type includes at least two eREGs in differentphysical resource block pairs. Assuming that a second resource group ofthe second type includes two eREGs in different physical resource blockpairs, the second resource group of the second type may include eREG (0)in a physical resource block pair indexed 3 and eREG (0) in a physicalresource block pair indexed 4 in FIG. 10, and a corresponding pilot portis the DMRS port 7; or the second resource group of the second type mayinclude eREG (1) in a physical resource block pair indexed 3 and eREG(4) in a physical resource block pair indexed 4, and a correspondingpilot port is the DMRS port 9; or the second resource group of thesecond type may consist of eREG (6) in a physical resource block pairindexed 2 and eREG (7) in a physical resource block pair indexed 3, andcorresponding pilot ports are the DMRS port 10 and 8, and so on. Asshown in FIG. 10, if eREGs that constitute a second resource group ofthe first type or second type are determined, a pilot port correspondingto the second resource group of the first type or second type is alsodetermined.

It is noted herein that the physical resource block set used fortransmitting the E-PDCCH as shown in FIG. 10 includes four physicalresource block pairs, but is not limited thereto. On the basis of Table2, another optional correspondence between the second resource groups ofthe first type and second type and the first resource groups and thepilot ports is showin in FIG. 11.

Step 102: Determine at least one second resource group of the first typeor second resource group of the second type used for transmitting anE-PDCCH, and map, according to the determined correspondence between thesecond resource groups of the first type or second type and the firstresource groups and pilot ports, the at least one second resource groupof the first type or second resource group of the second type used fortransmitting the E-PDCCH, to at least one first resource group and pilotport for transmission.

If the E-PDCCH needs to be transmitted in localized mode, the basestation determines at least one second resource group of the first typeused for transmitting the E-PDCCH, and then maps, according to thepreviously determined correspondence between the second resource groupsof the first type and the first resource groups and the pilot ports, theat least one second resource group of the first type used fortransmitting the E-PDCCH, to at least one first resource group and pilotport for transmission.

If the E-PDCCH needs to be transmitted in distributed mode, the basestation determines at least one second resource group of the second typeused for transmitting the E-PDCCH, and then maps, according to thepreviously determined correspondence between the second resource groupsof the second type and the first resource groups and the pilot ports,the at least one second resource group of the second type used fortransmitting the E-PDCCH, to at least one first resource group and pilotport for transmission.

In the prior art, CRS transmission is used for transmitting a PDCCH, allCCEs for transmitting the PDCCH are mapped to a same CRS port, and anSFBC mode or both an SFBC mode and an FSTD mode are used fortransmission. However, DMRS transmission is used for the E-PDCCH, andprecoding (precoding) is required for the DMRS. Therefore, acorrespondence between eCCEs or physical channel candidates fortransmitting the E-PDCCH and DMRS ports needs to be determined, so thatdemodulation can be completed correctly. Apparently, the PDCCHtransmission mode in the prior art is no longer applicable to theE-PDCCH. In this embodiment, the correspondence between the secondresource groups of the first type and the first resource groups and thepilot ports, and the correspondence between the second resource groupsof the second type and the first resource groups and the pilot ports aredetermined according to the mapping relationship between the firstresource groups and the pilot ports; then the second resource groups(the second resource groups of the first type or the second resourcegroups of the second type) used for transmitting the E-PDCCH aredetermined; and then according to the correspondence between the secondresource groups of the two types and the first resource groups and thepilot ports, the second resource groups used for transmitting theE-PDCCH are mapped to the corresponding first resource groups and pilotports for transmission. Thereby, an E-PDCCH transmission problem isresolved, and a basis is laid for correctly demodulating the E-PDCCH.

In an optional implementation manner of this embodiment, anotheroptional mapping relationship between the first resource groups and thepilot ports is shown in Table 2.

TABLE 3 eREG position index (index) DMRS port (port) eREG (0) Port 7eREG (1) Port 8 eREG (2) Port 8 eREG (3) Port 7 eREG (4) Port 9 eREG (5)Port 10 eREG (6) Port 10 eREG (7) Port 9

As shown in Table 2, the physical resource element set is a physicalresource block pair, where each physical resource block pair includeseight eREGs, and the eight eREGs are mapped to four DMRS ports in total,which are a DMRS port 7, a DMRS port 8, a DMRS port 9, and a DMRS port10 respectively. A mapping relationship between each eREG and a DMRSport is different from the mapping relationship in Table 1, but themapping relationship between eREGs and DMRSs is not limited to thoseshown in Table 1 and Table 2.

On a basis of Table 2, another optional correspondence between thesecond resource groups of the first type and second type and the firstresource groups and the pilot ports is shown in FIG. 11.

As shown in FIG. 11, the physical resource block set used fortransmitting the E-PDCCH includes four physical resource block pairs,which are physical resource block pairs indexed 1, 2, 3, and 4respectively, where each physical resource block pair includes eighteREGs. A second resource group of the first type includes at least twoeREGs in a same physical resource block pair. Assuming that a secondresource group of the first type includes four eREGs in a same physicalresource block pair, the second resource group of the first type mayinclude eREG (0), eREG (1), eREG (2), and eREG (3) in a physicalresource block pair indexed 1 in FIG. 11, and corresponding pilot portsare the DMRS ports 7 and 8; or the second resource group of the firsttype includes eREG (4), eREG (5), eREG (6), and eREG (7) in a physicalresource block pair indexed 1, and corresponding pilot ports are theDMRS ports 9 and 10, and so on, which are not further listed. A secondresource group of the second type includes at least two eREGs indifferent physical resource block pairs. Assuming that a second resourcegroup of the second type includes four eREGs in different physicalresource block pairs, the second resource group of the second type mayinclude eREG (0) in physical resource block pairs indexed 1, 2, 3, and 4in FIG. 10, and a corresponding pilot port is the DMRS port 7; or thesecond resource group of the second type may include eREG (2) inphysical resource block pairs indexed 1 and 2 and eREG (3) in physicalresource block pairs indexed 3 and 4, and corresponding pilot ports arethe DMRS ports 8 and 7, and so on. As shown in FIG. 11, if eREGs thatconstitute a second resource group of the first type or second type aredetermined, a pilot port corresponding to the second resource group ofthe first type or second type is also determined.

It is noted herein that, on a basis shown in Table 1, a second resourcegroup of the first type and a second resource group of the second typemay also include four first resource groups, as shown in FIG. 12.Correspondingly, on a basis shown in Table 2, a second resource group ofthe first type and a second resource group of the second type may alsoinclude two first resource groups, and other cases are not furtherdescribed by using examples.

As shown in FIG. 12, assuming that a second resource group of the firsttype includes four eREGs in a same physical resource block pair, thesecond resource group of the first type may include eREG (0), eREG (1),eREG (2), and eREG (3) in a physical resource block pair indexed 1 inFIG. 12, and corresponding pilot ports are the DMRS ports 7, 8, 9, and10; or the second resource group of the first type includes eREG (4),eREG (5), eREG (6), and eREG (7) in a physical resource block pairindexed 1, and corresponding pilot ports are the DMRS ports 9, 7, 10,and 8; or the second resource group of the first type may also includeeREG (0), eREG (1), eREG (4), and eREG (5) in a physical resource blockpair indexed 2, and corresponding pilot ports are the DMRS ports 7 and9, and so on, which are not further listed. A second resource group ofthe second type includes at least two eREGs in different physicalresource block pairs. Assuming that a second resource group of thesecond type includes four eREGs in different physical resource blockpairs, the second resource group of the second type may include eREG (0)in physical resource block pairs indexed 1, 2, 3, and 4 in FIG. 10, anda corresponding pilot port is the DMRS port 7; or the second resourcegroup of the second type may include eREG (2) in physical resource blockpairs indexed 1 and 2 and eREG (3) in physical resource block pairsindexed 3 and 4, and corresponding pilot ports are the DMRS ports 8 and10, and so on. As shown in FIG. 12, if eREGs that constitute a secondresource group of the first type or second type are determined, a pilotport corresponding to the second resource group of the first type orsecond type is also determined.

In addition to the mapping relationship between the first resourcegroups and the pilot ports as shown in Table 1 and Table 2, othermapping relationships may also be used. For example, eREG (0) and eREG(5) correspond to a port 7; eREG (1) and eREG (4) correspond to a port10; eREG (2) and eREG (7) correspond to a port 8; and eREG (3) and eREG(6) correspond to a port 10.

In an optional implementation manner of this embodiment, that the basestation determines a correspondence between second resource groups of afirst type and first resource groups and pilot ports according to amapping relationship between the first resource groups and the pilotports and according to a specific relationship includes that: the basestation determines, according to the mapping relationship between thefirst resource groups and the pilot ports and according to the specificrelationship, that a port set corresponding to at least two firstresource groups corresponding to the second resource groups of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes at least two different pilot ports,and determines that a pilot port used for transmission by each secondresource group of the first type is a pilot port corresponding to thefirst or last one of the at least two first resource groupscorresponding to the second resource groups of the first type. Forexample, as shown in FIG. 10, the base station determines that at leasttwo first resource groups corresponding to a second resource group ofthe first type are two first resource groups, and that a port setcorresponding to the two first resource groups in the foregoing mappingrelationship between the first resource groups and the pilot portsincludes two different pilot ports, which are respectively the DMRS port7 and DMRS port 9 or are respectively the DMRS port 8 and DMRS port 10.For another example, as shown in FIG. 11, the base station determinesthat at least two first resource groups corresponding to a secondresource group of the first type are four first resource groups, andthat a port set corresponding to the four first resource groups in theforegoing mapping relationship between the first resource groups and thepilot ports includes four different pilot ports, which are respectivelythe DMRS ports 7,8, 9, and 10. For another example, as shown in FIG. 12,the base station determines that at least two first resource groupscorresponding to a second resource group of the first type are fourfirst resource groups, and that a port set corresponding to the fourfirst resource groups in the foregoing mapping relationship between thefirst resource groups and the pilot ports includes four different pilotports, which are respectively the DMRS ports 7, 8, 9, and 10, or that aport set corresponding to the four first resource groups in theforegoing mapping relationship between the first resource groups and thepilot ports includes two different pilot ports, which are respectivelythe DMRS ports 7 and 9. In a word, a port set corresponding to at leasttwo first resource groups corresponding to a second resource group ofthe first type includes at least two different pilot ports. Preferably,for a second resource group of the first type, using one of the pilotports during transmission is advantageous for saving pilot resources. Tounify pilot ports used during E-PDCCH transmission among differentsecond resource groups of the first type, it is specified that a pilotport corresponding to the first eREG or the last eREG in thecorresponding at least two eREGs is selected and used for transmission.

In an optional implementation manner of this embodiment, to improveutilization of first resource groups, the foregoing specificrelationship is specifically determining, according to the pilot portsused for transmitting the E-PDCCH by the second resource groups of thesecond type, the pilot ports used for transmitting the E-PDCCH by thefirst type, and further determining, according to the mappingrelationship between the first resource groups and the pilot ports, thecorrespondence between the first resource groups of the first type andthe first resource groups and pilot ports, and the correspondencebetween the second resources of the second type and the first resourcegroups and pilot ports. Based on this, the at least two different pilotports that are included in the port set corresponding to the at leasttwo first resource groups corresponding to the second resource groups ofthe first type in the foregoing mapping relationship between the firstresource groups and the pilot ports and that are determined by the basestation, are at least two pilot ports used for transmission in eachphysical resource block pair when the E-PDCCH is transmitted by using atleast one second resource group of the second type. The pilot ports usedfor transmission in each physical resource block pair when the E-PDCCHis transmitted by using the second resource groups of the second typemay be predefined. For example, if the pilot ports used for transmissionin each physical resource block pair when the E-PDCCH is transmitted byusing the second resource groups of the second type are the DMRS ports 7and 9, the at least two different pilot ports that are included in theport set corresponding to the at least two first resource groupscorresponding to the second resource groups of the first type in theforegoing mapping relationship between the first resource groups and thepilot ports and that are determined by the base station, are the DMRSports 7 and 9. As shown in FIG. 10, if the DMRS ports 7 and 9 are usedfor transmission in each physical resource block pair when the E-PDCCHis transmitted by using the second resource groups of the second type,it indicates that two eREGs corresponding to the second resource groupsof the first type are eREGs corresponding to the DMRS ports 7 and 9,which may be eREG (0) and eREG (1), or eREG (4) and eREG (5).

In an optional implementation manner of this embodiment, when a quantityof at least one second resource group of the second type used fortransmitting the E-PDCCH is greater than a preset quantity threshold,two pilot ports are used for transmission in each physical resourceblock pair, which may be a first pilot port and a second pilot port, ormay be a third pilot port and a fourth pilot port. That is, when theE-PDCCH is transmitted by using the second resource groups of the secondtype, the quantity of pilot ports used for transmission in each physicalresource block pair is not necessarily two. When a condition issatisfied, the quantity may be two, and may also be one, three, four,and so on. The first pilot port, second pilot port, third pilot port,and fourth pilot port are different DMRS ports. Which DMRS port isspecifically used is not limited. In addition, the first pilot port,second pilot port, third pilot port, and fourth pilot port are all pilotports to which first resource groups in a same physical resource blockpair are mapped.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the base station determines that each secondresource group of the first type corresponds to two first resourcegroups, and that a port set corresponding to the two first resourcegroups corresponding to the second resource group of the first type inthe foregoing mapping relationship between the first resource groups andthe pilot ports includes two different pilot ports, where the twodifferent pilot ports are respectively a first pilot port and a secondpilot port, or are respectively a third pilot port and a fourth pilotport. With reference to FIG. 10, it is assumed that the first pilot portis the DMRS port 7, and that the second pilot port is the DMRS port 9,and that the third pilot port is the DMRS port 8, and that the fourthpilot port is the DMRS port 10. Therefore, each second resource group ofthe first type corresponds to two eREGs, and pilot ports correspondingto the two eREGs are the DMRS ports 7 and 9, or pilot portscorresponding to the two eREGs are the DMRS ports 8 and 10. For eachsecond resource group of the first type, in actual transmission of theE-PDCCH, a pilot port in a corresponding port set is preferentiallyselected for transmission. For example, in FIG. 10, eREG (0)corresponding to the DMRS port 7 and eREG (1) corresponding to the DMRSport 9 constitute the first one of the second resource groups of thefirst type. When the E-PDCCH is transmitted by using the second resourcegroup of the first type, the transmission is based on a pilot portcorresponding to the first eREG, eREG (0), in the two eREGscorresponding to the second resource group of the first type, namely,the DMRS port 7. When the E-PDCCH is transmitted by using the secondresource group of the first type, a precoding mode used for eREG (0) andeREG (1) is the same as a precoding mode used for the DMRS port 7, andchannel estimation is performed for the two eREG (0) and eREG (1) basedon the DMRS port 7. In FIG. 10, eREG (2) corresponding to the DMRS port8 and eREG (3) corresponding to the DMRS port 10 constitute the secondone of the second resource groups of the first type. When the E-PDCCH istransmitted by using the second resource group of the first type, thetransmission is based on a pilot port corresponding to the first eREG,eREG (2), in the two eREGs corresponding to the second resource group ofthe first type, namely, the DMRS port 8. That is, when the E-PDCCH istransmitted by using the second resource group of the first type, aprecoding mode used for eREG (2) and eREG (3) is the same as a precodingmode used for the DMRS port 8, and channel estimation is performed forthe two eREG (2) and eREG (3) based on the DMRS port 8. In FIG. 10, eREG(4) corresponding to the DMRS port 9 and eREG (5) corresponding to theDMRS port 7 constitute the third second resource group of the firsttype. When the E-PDCCH is transmitted by using the second resource groupof the first type, the transmission is based on a pilot portcorresponding to the first eREG, eREG (4), in the two eREGscorresponding to the second resource group of the first type, namely,the DMRS port 9. That is, when the E-PDCCH is transmitted by using thesecond resource group of the first type, a precoding mode used for eREG(4) and eREG (5) is the same as a precoding mode used for the DMRS port9, and channel estimation is performed for the two eREG (4) and eREG (5)based on the DMRS port 9. In FIG. 10, eREG (6) corresponding to the DMRSport 10 and eREG (7) corresponding to the DMRS port 8 constitute thefourth second resource group of the first type. When the E-PDCCH istransmitted by using the second resource group of the first type, thetransmission is based on a pilot port corresponding to the first eREG,eREG (6), in the two eREGs corresponding to the second resource group ofthe first type, namely, the DMRS port 10. That is, when the E-PDCCH istransmitted by using the second resource group of the first type, aprecoding mode used for eREG (6) and eREG (7) is the same as a precodingmode used for the DMRS port 10, and channel estimation is performed forthe two eREG (6) and eREG (7) based on the DMRS port 10.

Further, on a basis that each second resource group of the first typecorresponds to two first resource groups, each physical resource blockpair may include four second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total, as shown in Table 1 and Table 2, and FIG. 10 to FIG 12.Two different pilot ports included in a port set corresponding to twofirst resource groups corresponding to two second resource groups of thefirst type included in a physical resource block pair in the foregoingmapping relationship between the first resource groups and the pilotports are uniformly a first pilot port and a second pilot port; and twodifferent pilot ports included in a port set corresponding to two firstresource groups corresponding to the other two second resource groups ofthe first type included in the physical resource block pair in theforegoing mapping relationship between the first resource groups and thepilot ports are uniformly a third pilot port and a fourth pilot port. Inaddition, for two second resource groups of the first type correspondingto two first resource groups corresponding to the pilot port setincluding the first pilot port and second pilot port, the two firstresource groups in the two second resource groups of the first type arearranged in different sequences according to the pilot ports; likewise,for two second resource groups of the first type corresponding to twofirst resource groups corresponding to the pilot set including the thirdpilot port and fourth pilot port, the two first resource groups in thetwo second resource groups of the first type are arranged in differentsequences according to the pilot ports. With reference to FIG. 10, aphysical resource block pair indexed 1 includes four second resourcegroups of the first type, which are respectively a second resource groupof the first type that includes eREG (0) and eREG (1), a second resourcegroup of the first type that includes eREG (2) and eREG (3), a secondresource group of the first type that includes eREG (4) and eREG (5),and a second resource group of the first type that includes eREG (6) andeREG (7). The second resource group of the first type that includes eREG(0) and eREG (1) and the second resource group of the first type thatincludes eREG (4) and eREG (5) correspond to same pilot ports, which arerespectively the DMRS ports 7 and 9, and after an arrangement accordingto pilot ports, sequences of the DMRS ports 7 and 9 in the two secondresource groups of the first type are different. For example, in thesecond resource group of the first type that includes eREG (0) and eREG(1), the sequence of the DMRS ports 7 and 9 is first the DMRS port 7 andthen the DMRS port 9; and in the second resource group of the first typethat includes eREG (4) and eREG (5), the sequence of the DMRS ports 7and 9 is first the DMRS port 9 and then the DMRS port 7. The secondresource group of the first type that includes eREG (2) and eREG (3) andthe second resource group of the first type that includes eREG (6) andeREG (7) correspond to same pilot ports, which are respectively the DMRSports 8 and 10, and after an arrangement according to pilot ports,sequences of the DMRS ports 8 and 9 in the two second resource groups ofthe first type are different. For example, in the second resource groupof the first type that includes eREG (2) and eREG (3), the sequence ofthe DMRS ports 8 and 10 is first the DMRS port 8 and then the DMRS port10; and in the second resource group of the first type that includeseREG (6) and eREG (7), the sequence of the DMRS ports 8 and 10 is firstthe DMRS port 10 and then the DMRS port 8.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the base station determines that each secondresource group of the first type corresponds to four first resourcegroups, and that a port set corresponding to the four first resourcegroups corresponding to the second resource group of the first type inthe foregoing mapping relationship between the first resource groups andthe pilot ports includes four different pilot ports, where the fourdifferent pilot ports are respectively a first pilot port, a secondpilot port, a third pilot port, and a fourth pilot port. With referenceto FIG. 12, it is assumed that the first pilot port is the DMRS port 7,and that the second pilot port is the DMRS port 9, and that the thirdpilot port is the DMRS port 8, and that the fourth pilot port is theDMRS port 10. Therefore, each second resource group of the first typecorresponds to four eREGs, and pilot ports corresponding to the foureREGs are the DMRS ports 7, 8, 9, and 10. For each second resource groupof the first type, in actual transmission of the E-PDCCH, a pilot portin a corresponding port set is preferentially selected for transmission.For example, in FIG. 12, eREG (0) corresponding to the DMRS port 7, eREG(1) corresponding to the DMRS port 9, eREG (2) corresponding to the DMRSport 8, and eREG (3) corresponding to the DMRS port 10 constitute thefirst one of the second resource groups of the first type. When theE-PDCCH is transmitted by using the second resource group of the firsttype, the transmission is based on a pilot port corresponding to thefirst eREG, eREG (0), in the four eREGs corresponding to the secondresource group of the first type, namely, the DMRS port 7. That is, whenthe E-PDCCH is transmitted by using the second resource group of thefirst type, a precoding mode used for eREG (0), eREG (1), eREG (2), andeREG (3) is the same as a precoding mode used for the DMRS port 7, andchannel estimation is performed for the four eREG (0), eREG (1), eREG(2), and eREG (3) based on the DMRS port 7. In FIG. 12, eREG (4)corresponding to the DMRS port 9, eREG (5) corresponding to the DMRSport 7, eREG (6) corresponding to the DMRS port 10, and eREG (7)corresponding to the DMRS port 8 constitute the second one of the secondresource groups of the first type. When the E-PDCCH is transmitted byusing the second resource group of the first type, the transmission isbased on a pilot port corresponding to the first eREG, eREG (4), in thefour eREGs corresponding to the second resource group of the first type,namely, the DMRS port 9. That is, when the E-PDCCH is transmitted byusing the second resource group of the first type, a precoding mode usedfor eREG (4), eREG (5), eREG (6), and eREG (7) is the same as aprecoding mode used for the DMRS port 9, and channel estimation isperformed for the four eREG (4), eREG (5), eREG (6), and eREG (7) basedon the DMRS port 9.

On a basis that each second resource group of the first type correspondsto four first resource groups, each physical resource block pairincludes two second resource groups of the first type. In this case,each physical resource block pair includes eight first resource groupsin total. Four different pilot ports included in a port setcorresponding to four first resource groups corresponding to the twosecond resource groups of the first type included in a physical resourceblock pair in the foregoing mapping relationship between the firstresource groups and the pilot ports are uniformly a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port, and thefour first resource groups in the two second resource groups of thefirst type included in the physical resource block pair are arranged indifferent sequences according to the pilot ports. Manners of arrangingpilot ports in the two second resource groups of the first type includedin the physical resource block pair may be any different. For example,an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the second pilot port, the third pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe second pilot port, the first pilot port, the fourth pilot port, andthe third pilot port; or an arrangement of pilot ports in one secondresource group of the first type included in the physical resource blockpair is the first pilot port, the second pilot port, the third pilotport, and the fourth pilot port, but an arrangement of pilot ports inthe other second resource group of the first type included in thephysical resource block pair is the fourth pilot port, the third pilotport, the second pilot port, and the first pilot port; or an arrangementof pilot ports in one second resource group of the first type includedin the physical resource block pair is the first pilot port, the thirdpilot port, the second pilot port, and the fourth pilot port, but anarrangement of pilot ports in the other second resource group of thefirst type included in the physical resource block pair is the thirdpilot port, the first pilot port, the fourth pilot port, and the secondpilot port.

With reference to FIG. 12, a physical resource block pair indexed 1includes two second resource groups of the first type, which arerespectively a second resource group of the first type that includeseREG (0), eREG (1), eREG (2), and eREG (3), and a second resource groupof the first type that includes eREG (4), eREG (5), eREG (6), and eREG(7). The second resource group of the first type that includes eREG (0),eREG (1), eREG (2), and eREG (3), and the second resource group of thefirst type that includes eREG (4), eREG (5), eREG (6), and eREG (7)correspond to same pilot ports, which are respectively the DMRS ports 7,8, 9, and 10, and after an arrangement according to pilot ports,sequences of the DMRS ports 7, 8, 9, and 10 in the two second resourcegroups of the first type are different. For example, in the secondresource group of the first type that includes eREG (0), eREG (1), eREG(2), and eREG (3), the sequence of the DMRS ports 7, 8, 9, and 10 is theDMRS port 7, the DMRS port 9, the DMRS port 8, and the DMRS port 10; andin the second resource group of the first type that includes eREG (4),eREG (5), eREG (6), and eREG (7), the sequence of the DMRS ports 7, 8,9, and 10 is the DMRS port 9, the DMRS port 7, the DMRS port 10, and theDMRS port 8. In addition, in the second resource group of the first typethat includes eREG (0), eREG (1), eREG (2), and eREG (3), the sequenceof DMRS ports 7, 8, 9, and 10 may also be the DMRS port 7, the DMRS port8, the DMRS port 9, and the DMRS port 10; and in the second resourcegroup of the first type that includes eREG (4), eREG (5), eREG (6), andeREG (7), the sequence of DMRS ports 7, 8, 9, and 10 may be the DMRSport 10, the DMRS port 9, the DMRS port 8, and the DMRS port 7, and soon.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the base station determines that each secondresource group of the first type corresponds to four first resourcegroups, and that a port set corresponding to the four first resourcegroups corresponding to the second resource group of the first type inthe foregoing mapping relationship between the first resource groups andthe pilot ports includes two different pilot ports, where the twodifferent pilot ports are respectively a first pilot port and a secondpilot port, or are respectively a third pilot port and a fourth pilotport. With reference to FIG. 11, it is assumed that the first pilot portis the DMRS port 7, and that the second pilot port is the DMRS port 8,and that the third pilot port is the DMRS port 9, and that the fourthpilot port is the DMRS port 10. Therefore, each second resource group ofthe first type corresponds to four eREGs, and pilot ports correspondingto the four eREGs are the DMRS ports 7 and 8 or the DMRS ports 9 and 10.For each second resource group of the first type, in actual transmissionof the E-PDCCH, a pilot port in a corresponding port set ispreferentially selected for transmission. For example, in FIG. 11, eREG(0) corresponding to the DMRS port 7, eREG (1) corresponding to the DMRSport 8, eREG (2) corresponding to the DMRS port 8, and eREG (3)corresponding to the DMRS port 7 constitute the first one of the secondresource groups of the first type. When the E-PDCCH is transmitted byusing the second resource group of the first type, the transmission isbased on a pilot port corresponding to the first eREG, eREG (0), in thefour eREGs corresponding to the second resource group of the first type,namely, the DMRS port 7. When the E-PDCCH is transmitted by using thesecond resource group of the first type, a precoding mode used for eREG(0), eREG (1), eREG (2), and eREG (3) is the same as a precoding modeused for the DMRS port 7, and channel estimation is performed for thefour eREG (0), eREG (1), eREG (2), and eREG (3) based on the DMRS port7. In FIG. 11, eREG (4) corresponding to the DMRS port 9, eREG (5)corresponding to the DMRS port 10, eREG (6) corresponding to the DMRSport 10, and eREG (7) corresponding to the DMRS port 9 constitute thesecond one of the second resource groups of the first type. When theE-PDCCH is transmitted by using the second resource group of the firsttype, the transmission is based on a pilot port corresponding to thefirst eREG, eREG (4), in the four eREGs corresponding to the secondresource group of the first type, namely, the DMRS port 9. That is, whenthe E-PDCCH is transmitted by using the second resource group of thefirst type, a precoding mode used for eREG (4), eREG (5), eREG (6), andeREG (7) is the same as a precoding mode used for the DMRS port 9, andchannel estimation is performed for the four eREG (4), eREG (5), eREG(6), and eREG (7) based on the DMRS port 9.

On a basis that each second resource group of the first type correspondsto four first resource groups, each physical resource block pairincludes two second resource groups of the first type. In this case,each physical resource block pair includes eight first resource groupsin total. Two different pilot ports included in a port set correspondingto four first resource groups corresponding to one second resource groupof the first type included in a physical resource block pair in theforegoing mapping relationship between the first resource groups and thepilot ports are a first pilot port and a second pilot port; and twodifferent pilot ports included in a port set corresponding to four firstresource groups corresponding to the other second resource group of thefirst type included in the physical resource block pair in the foregoingmapping relationship between the first resource groups and the pilotports are a third pilot port and a fourth pilot port. With reference toFIG. 11, a physical resource block pair indexed 1 includes two secondresource groups of the first type, which are respectively a secondresource group of the first type that includes eREG (0), eREG (1), eREG(2), and eREG (3), and a second resource group of the first type thatincludes eREG (4), eREG (5), eREG (6), and eREG (7). The second resourcegroup of the first type that includes eREG (0), eREG (1), eREG (2), andeREG (3), and the second resource group of the first type that includeseREG (4), eREG (5), eREG (6), and eREG (7) correspond to different pilotports. For example, the pilot ports corresponding to the second resourcegroup of the first type that includes eREG (0), eREG (1), eREG (2), andeREG (3) are the DMRS ports 7 and 8, and the pilot ports correspondingto the second resource group of the first type that includes eREG (4),eREG (5), eREG (6), and eREG (7) are the DMRS ports 9 and 10.

On a basis of each of the foregoing embodiments or implementationmanners, at least two first resource groups corresponding to each secondresource group of the second type used for transmitting the E-PDCCH,which are determined by the base station, are first resource groupslocated in different physical resource block pairs, corresponding to asame pilot port, and having a same position index. For example, a secondresource group of the second type enclosed in a solid line box as shownin FIG. 10 is a resource group that includes two eREGs bothcorresponding to the DMRS port 7 and both having a position index of 0in two physical resource block pairs indexed 3 and 4. For anotherexample, a second resource group of the second type enclosed in a solidline box as shown in FIG. 11 and FIG. 12 is a resource group thatincludes four eREGs all corresponding to the DMRS port 7 and all havinga position index of 0 in four physical resource block pairs indexed 1,2, 3, and 4.

On a basis of each of the foregoing embodiments or implementationmanners, at least two first resource groups corresponding to each secondresource group of the second type used for transmitting the E-PDCCH,which are determined by the base station, are first resource groupslocated in different physical resource block pairs, corresponding to asame pilot port, and having different position indexes. For example, asecond resource group of the second type enclosed in two dotted lineboxes connected by a solid line as shown in FIG. 10 is a resource groupthat includes two eREGs both corresponding to the DMRS port 9 and havingposition indexes of 1 and 4 respectively in two physical resource blockpairs indexed 3 and 4. For another example, a second resource group ofthe second type enclosed in two dotted line boxes connected by a solidline as shown in FIG. 11 is a resource group that includes four eREGsrespectively corresponding to the DMRS ports 8 and 7 and having positionindexes of 2 and 3 respectively in four physical resource block pairsindexed 1, 2, 3, and 4. For another example, with reference to FIG. 11,a second resource group of the second type may also include an eREGcorresponding to the DMRS port 7 and having a position index of 0 in aphysical resource block pair indexed 1, an eREG corresponding to theDMRS port 8 and having a position index of 1 in a physical resourceblock pair indexed 2, an eREG corresponding to the DMRS port 8 andhaving a position index of 2 in a physical resource block pair indexed3, and an eREG corresponding to the DMRS port 7 and having a positionindex of 3 in a physical resource block pair indexed 4. For anotherexample, with reference to FIG. 11, a second resource group of thesecond type may also consist of an eREG corresponding to the DMRS port 7and having a position index of 0 in a physical resource block pairindexed 1, an eREG corresponding to DMRS port 8 and having a positionindex of 1 in a physical resource block pair indexed 2, an eREGcorresponding to DMRS port 9 and having a position index of 4 in aphysical resource block pair indexed 3, and an eREG corresponding to theDMRS port 10 and having a position index of 5 in a physical resourceblock pair indexed 4.

In an optional implementation manner of this embodiment, on a basis ofimplementation of second resource groups of the first type in each ofthe foregoing implementation manners, at least two first resource groupscorresponding to each second resource group of the second type used fortransmitting the E-PDCCH, which are determined by the base station, arefirst resource groups that are located in different physical resourceblock pairs and have position indexes same as position indexes of atleast two first resource groups corresponding to the second resourcegroups of the first type. For example, a second resource group of thesecond type enclosed in two dotted line boxes connected by a dotted lineas shown in FIG. 10 includes a first resource group corresponding to theDMRS port 10 and having a position index of 6 in a physical resourceblock pair indexed 2 and a first resource group corresponding to theDMRS port 8 and having a position index of 7 in a physical resourceblock pair indexed 4. The second resource group of the second typecorresponds to a second resource group of the first type that includestwo first resource groups having position indexes of 6 and 7 in aphysical resource block pair indexed 1 in FIG. 10, and position indexesof the first resource groups corresponding to the two second resourcegroups are the same. For another example, with reference to FIG. 12, ifa second resource group of the first type includes four first resourcegroups having position indexes of 0, 1, 2, and 3 in a physical resourceblock pair indexed 1, the base station may accordingly determine that asecond resource group of the second type includes a first resource grouphaving a position index of 0 in a physical resource block pair indexed1, a first resource group having a position index of 1 in a physicalresource block pair indexed 2, a first resource group having a positionindex of 2 in a physical resource block pair indexed 3, and a firstresource group having a position index of 3 in a physical resource blockpair indexed 4. In addition, the base station may also determine that asecond resource group of the second type includes a first resource grouphaving a position index of 0 in a physical resource block pair indexed4, a first resource group having a position index of 1 in a physicalresource block pair indexed 3 a first resource group having a positionindex of 2 in a physical resource block pair indexed 2, and a firstresource group having a position index of 3 in a physical resource blockpair indexed 0, and so on, where there are multiple manners ofcomposition.

The following describes a beneficial effect produced by each of theforegoing implementation manners To further obtain space diversity in asame physical resource block pair, a general practice is to allocatemultiple pilot ports for implementation. However, improper allocation ofpilot ports causes a waste of pilot port resources, and isdisadvantageous for channel estimation. For example, another mappingrelationship between the first resource groups and the DMRS ports isshown in FIG. 13.

As shown in FIG. 13, if the DMRS port 7 and DMRS port 9 are allocated tosecond resource groups of the second type used for transmitting theE-PDCCH and used as pilot ports for transmission in each physicalresource block pair, and two second resource groups of the second typeused for transmitting the E-PDCCH are shown in solid line boxes shown inFIG. 13, then in a physical resource block pair indexed 1, only firstresource groups shown in dotted line boxes in FIG. 13 can be used toconstitute a second resource group of the first type, where eREG (1) andeREG (5) cannot be used, and a waste is caused. In each of the foregoingembodiments or implementation manners of the present invention, theforegoing problem may be resolved by setting the mapping relationshipbetween the first resource groups and the pilot ports, and thendetermining the second resource groups of the first type, the secondresource groups of the second type and the corresponding pilot portsaccording to the mapping relationship between the first resource groupsand the pilot ports and the specific relationship, and so on. Thereby,pilot port resources can be fully used, and pilot port pairs can beconfigured flexibly, and space diversity brought by the pilot ports canbe fully used.

FIG. 1B is a flowchart of an E-PDCCH reception method according to anembodiment of the present invention. This embodiment is executed by aUE, but is not limited thereto. As shown in FIG. 1B, the method in thisembodiment includes:

Step 201: Determine a correspondence between second resource groups of afirst type and first resource groups and pilot ports, and acorrespondence between second resource groups of a second type and firstresource groups and pilot ports according to a mapping relationshipbetween the first resource groups and the pilot ports and according to aspecific relationship.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport. The first resource groups are eREGs or REGs, the second resourcegroups of the first type are eCCEs or control channel candidates, thesecond resource groups of the second type are eCCEs or control channelcandidates, and the physical resource element set is at least onephysical resource block pair. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. A correspondence between second resource groups of differenttypes and the first resource groups and pilot port satisfies theforegoing specific relationship.

Step 202: Determine at least one second resource group of the first typeor second resource group of the second type used for transmitting anE-PDCCH, and receive, according to the determined correspondence betweenthe second resource groups of the first type or second type and thefirst resource groups and pilot ports, the at least one second resourcegroup of the first type or second resource group of the second type usedfor transmitting the E-PDCCH, on at least one first resource group andpilot port.

For step 201 in this embodiment, refer to the description of step 101.For step 202, refer to the description of step 102. A difference fromstep 102 lies in that the UE in this embodiment receives the at leastone second resource group of the first type or second resource group ofthe second type used for transmitting the E-PDCCH, on at least one firstresource group and pilot port, unlike step 102 in which the at least onesecond resource group of the first type or second resource group of thesecond type used for transmitting the E-PDCCH is mapped to at least onefirst resource group and pilot port for transmission. The process inwhich the UE receives the at least one second resource group of thefirst type or second resource group of the second type used fortransmitting the E-PDCCH, on the at least one first resource group andpilot port, is a blind detection process. The blind detection process inthis embodiment is similar to a blind detection process in the priorart, and is not further described herein.

In this embodiment, the second resource groups include two types: secondresource groups of the first type and second resource groups of thesecond type. Optionally, the second resource groups of the first typeare resource groups for transmitting an E-PDCCH in localized mode, andthe second resource groups of the second type are resource groups fortransmitting the E-PDCCH in distributed mode. Herein the transmission inlocalized mode means that resources for transmitting the E-PDCCH areallocated and centralized in one or several consecutive physicalresource block pairs, and the transmission in distributed mode meansthat resources for transmitting the E-PDCCH are allocated anddecentralized in multiple non-consecutive physical resource block pairs.

For an optional mapping relationship between the first resource groupsand the pilot ports that is described by using examples, refer to Table1 and Table 2, but the mapping relationship is not limited thereto.

In an optional implementation manner of this embodiment, that the UEdetermines a correspondence between second resource groups of a firsttype and first resource groups and pilot ports according to a mappingrelationship between the first resource groups and the pilot ports andaccording to a specific relationship includes that: the UE determines,according to the mapping relationship between the first resource groupsand the pilot ports and according to the specific relationship, that aport set corresponding to at least two first resource groupscorresponding to the second resource groups of the first type in theforegoing mapping relationship between the first resource groups and thepilot ports includes at least two different pilot ports, and determinesthat a pilot port used for transmission by each second resource group ofthe first type is a pilot port corresponding to the first or last one ofthe at least two first resource groups corresponding to the secondresource groups of the first type.

In an optional implementation manner of this embodiment, to improveutilization of first resource groups, the foregoing specificrelationship is specifically determining, according to the pilot portsused for transmitting the E-PDCCH by the second resource groups of thesecond type, the pilot ports used for transmitting the E-PDCCH by thefirst type, and further determining, according to the mappingrelationship between the first resource groups and the pilot ports, thecorrespondence between the first resource groups of the first type andthe first resource groups and pilot ports, and the correspondencebetween the second resources of the second type and the first resourcegroups and pilot ports. Based on this, the at least two different pilotports that are included in the port set corresponding to the at leasttwo first resource groups corresponding to the second resource groups ofthe first type in the foregoing mapping relationship between the firstresource groups and the pilot ports and that are determined by the UE,are at least two pilot ports used for transmission in each physicalresource block pair when the E-PDCCH is transmitted by using at leastone second resource group of the second type. The pilot ports used fortransmission in each physical resource block pair when the E-PDCCH istransmitted by using the second resource groups of the second type maybe predefined.

In an optional implementation manner of this embodiment, when a quantityof at least one second resource group of the second type used fortransmitting the E-PDCCH is greater than a preset quantity threshold,two pilot ports are used for transmission in each physical resourceblock pair, which may be a first pilot port and a second pilot port, ormay be a third pilot port and a fourth pilot port. That is, when theE-PDCCH is transmitted by using the second resource groups of the secondtype, the quantity of pilot ports used for transmission in each physicalresource block pair is not necessarily two. When a condition issatisfied, the quantity may be two, and may also be one, three, four,and so on. The first pilot port, second pilot port, third pilot port,and fourth pilot port are different DMRS ports. Which DMRS port isspecifically used is not limited. In addition, the first pilot port,second pilot port, third pilot port, and fourth pilot port are all pilotports to which first resource groups in a same physical resource blockpair are mapped.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the UE determines that each second resourcegroup of the first type corresponds to two first resource groups, andthat a port set corresponding to the two first resource groupscorresponding to the second resource group of the first type in theforegoing mapping relationship between the first resource groups and thepilot ports includes two different pilot ports, where the two differentpilot ports are respectively a first pilot port and a second pilot port,or are respectively a third pilot port and a fourth pilot port.

Further, on a basis that each second resource group of the first typecorresponds to two first resource groups, each physical resource blockpair may include four second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total, as shown in Table 1 and Table 2, and FIG. 10 to FIG.12. Two different pilot ports included in a port set corresponding totwo first resource groups corresponding to two second resource groups ofthe first type included in a physical resource block pair in theforegoing mapping relationship between the first resource groups and thepilot ports are uniformly a first pilot port and a second pilot port;and two different pilot ports included in a port set corresponding totwo first resource groups corresponding to the other two second resourcegroups of the first type included in the physical resource block pair inthe foregoing mapping relationship between the first resource groups andthe pilot ports are uniformly a third pilot port and a fourth pilotport. In addition, for two second resource groups of the first typecorresponding to two first resource groups corresponding to the pilotset including the first pilot port and second pilot port, the two firstresource groups in the two second resource groups of the first type arearranged in different sequences according to the pilot ports; likewise,for two second resource groups of the first type corresponding to twofirst resource groups corresponding to the pilot set including the thirdpilot port and fourth pilot port, the two first resource groups in thetwo second resource groups of the first type are arranged in differentsequences according to the pilot ports.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the UE determines that each second resourcegroup of the first type corresponds to four first resource groups, andthat a port set corresponding to the four first resource groupscorresponding to the second resource group of the first type in theforegoing mapping relationship between the first resource groups and thepilot port includes four different pilot ports, where the four differentpilot ports are respectively a first pilot port, a second pilot port, athird pilot port, and a fourth pilot port.

On a basis that each second resource group of the first type correspondsto four first resource groups, each physical resource block pairincludes two second resource groups of the first type. In this case,each physical resource block pair includes eight first resource groupsin total. Four different pilot ports included in a port setcorresponding to four first resource groups corresponding to the twosecond resource groups of the first type included in a physical resourceblock pair in the foregoing mapping relationship between the firstresource groups and the pilot ports are uniformly a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port, and thefour first resource groups in the two second resource groups of thefirst type included in the physical resource block pair are arranged indifferent sequences according to the pilot ports. Manners of arrangingpilot ports in the two second resource groups of the first type includedin the physical resource block pair may be any different. For example,an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the second pilot port, the third pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe second pilot port, the first pilot port, the fourth pilot port, andthe third pilot port; or an arrangement of pilot ports in one secondresource group of the first type included in the physical resource blockpair is the first pilot port, the second pilot port, the third pilotport, and the fourth pilot port, but an arrangement of pilot ports inthe other second resource group of the first type included in thephysical resource block pair is the fourth pilot port, the third pilotport, the second pilot port, and the first pilot port; or an arrangementof pilot ports in one second resource group of the first type includedin the physical resource block pair is the first pilot port, the thirdpilot port, the second pilot port, and the fourth pilot port, but anarrangement of pilot ports in the other second resource group of thefirst type included in the physical resource block pair is the thirdpilot port, the first pilot port, the fourth pilot port, and the secondpilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat a quantity of pilot ports used for transmission in each physicalresource block pair is two, the UE determines that each second resourcegroup of the first type corresponds to four first resource groups, andthat a port set corresponding to the four first resource groupscorresponding to the second resource group of the first type in theforegoing mapping relationship between the first resource groups and thepilot ports includes two different pilot ports, where the two differentpilot ports are respectively a first pilot port and a second pilot port,or are respectively a third pilot port and a fourth pilot port.

On a basis that each second resource group of the first type correspondsto four first resource groups, each physical resource block pairincludes two second resource groups of the first type. In this case,each physical resource block pair includes eight first resource groupsin total. Two different pilot ports included in a port set correspondingto four first resource groups corresponding to one second resource groupof the first type included in a physical resource block pair in theforegoing mapping relationship between the first resource groups and thepilot ports are a first pilot port and a second pilot port; and twodifferent pilot ports included in a port set corresponding to four firstresource groups corresponding to the other second resource group of thefirst type included in the physical resource block pair in the foregoingmapping relationship between the first resource groups and the pilotports are a third pilot port and a fourth pilot port.

On a basis of each of the foregoing embodiments or implementationmanners, at least two first resource groups corresponding to each secondresource group of the second type used for transmitting the E-PDCCH,which are determined by the UE, are first resource groups located indifferent physical resource block pairs, corresponding to a same pilotport, and having a same position index.

On a basis of each of the foregoing embodiments or implementationmanners, at least two first resource groups corresponding to each secondresource group of the second type used for transmitting the E-PDCCH,which are determined by the UE, are first resource groups located indifferent physical resource block pairs, corresponding to a same pilotport, and having different position indexes.

In an optional implementation manner of this embodiment, on a basis ofimplementation of second resource groups of the first type in each ofthe foregoing implementation manners, at least two first resource groupscorresponding to each second resource group of the second type used fortransmitting the E-PDCCH, which are determined by the UE, are firstresource groups that are located in different physical resource blockpairs and have position indexes same as position indexes of at least twofirst resource groups corresponding to the second resource groups of thefirst type.

For the detailed description of each of the foregoing optionalimplementation manners, refer to the corresponding description in theembodiment shown in FIG. 1A, and no further description is providedherein.

In another optional implementation manner of this embodiment, the UEneeds to obtain the mapping relationship between the first resourcegroups and the pilot ports in advance before using the mappingrelationship between the first resource groups and the pilot ports. Amanner in which the UE obtains the mapping relationship between thefirst resource groups and the pilot ports includes that: the UE and abase station predefine the mapping relationship between the firstresource groups and the pilot ports; or the UE agrees with a basestation in advance that the mapping relationship between the firstresource groups and the pilot ports is generated according to a localcell ID. In the two cases, the base station does not need to send themapping relationship between the first resource groups and the pilotports to the UE, and instead, the UE may directly obtain the mappingrelationship between the first resource groups and the pilot ports.Another manner is that: the UE receives higher layer signaling sent bythe base station, where the higher layer signaling includes the mappingrelationship between the first resource groups and the pilot ports, andthe UE obtains the mapping relationship between the first resourcegroups and the pilot ports from the higher layer signaling. This manneris convenient for the base station to flexibly configure the mappingrelationship between the first resource groups and the pilot ports.

The E-PDCCH reception method provided by this embodiment corresponds tothe E-PDCCH transmission method provided by the foregoing embodiment,and the UE may successfully receive an E-PDCCH, thereby resolving anE-PDCCH transmission problem. In addition, the method in this embodimentmay improve utilization of pilot ports, and may fully use spacediversity effect brought by the pilot ports.

FIG. 2A is a schematic structural diagram of a base station according toan embodiment of the present invention. As shown in FIG. 2A, the basestation in this embodiment includes a first determining unit 21, asecond determining unit 22, and a mapping and transmission unit 23.

The first determining unit 21 is configured to determine acorrespondence between second resource groups of a first type and firstresource groups and pilot ports, and a correspondence between secondresource groups of a second type and first resource groups and pilotports according to a mapping relationship between the first resourcegroups and the pilot ports and according to a specific relationship.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport. The first resource groups are eREGs or REGs, the second resourcegroups of the first type are eCCEs or control channel candidates, andthe second resource groups of the second type are eCCEs or controlchannel candidates. The physical resource element set is at least onephysical resource block pair. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. A correspondence between second resource groups of differenttypes and the first resource groups and pilot port satisfies theforegoing specific relationship.

The second determining unit 22 is configured to determine at least onesecond resource group of the first type or second resource group of thesecond type used for transmitting an E-PDCCH.

The mapping and transmission unit 23 is connected to the firstdetermining unit 21 and the second determining unit 22, and configuredto map, according to the correspondence between the second resourcegroups of the first type or second type and the first resource groupsand pilot ports that is determined by the first determining unit 21, theat least one second resource group of the first type or second resourcegroup of the second type that is used for transmitting the E-PDCCH andis determined by the second determining unit 22, to at least one firstresource group and pilot port for transmission.

In an optional implementation manner of this embodiment, the secondresource groups of the first type are resource groups for transmittingthe E-PDCCH in localized mode, and the second resource groups of thesecond type are resource groups for transmitting the E-PDCCH indistributed mode.

In an optional implementation manner of this embodiment, that the firstdetermining unit 21 determines a correspondence between second resourcegroups of a first type and first resource groups and pilot portsaccording to a mapping relationship between the first resource groupsand the pilot ports and according to a specific relationship includesthat: the first determining unit 21 is specifically configured todetermine, according to the mapping relationship between the firstresource groups and the pilot ports and according to the specificrelationship, that a port set corresponding to at least two firstresource groups corresponding to the second resource groups of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes at least two different pilot ports,and determine that a pilot port used for transmission by each secondresource group of the first type is a pilot port corresponding to thefirst or last one of the at least two first resource groupscorresponding to the second resource groups of the first type.

In an optional implementation manner of this embodiment, that the firstdetermining unit 21 determines that a port set corresponding to at leasttwo first resource groups corresponding to the second resource groups ofthe first type in the foregoing mapping relationship between the firstresource groups and the pilot ports includes at least two differentpilot ports, includes that: the first determining unit 21 is morespecifically configured to determine that the at least two differentpilot ports that are included in the port set corresponding to the atleast two first resource groups corresponding to the second resourcegroups of the first type in the foregoing mapping relationship betweenthe first resource groups and the pilot ports are at least two pilotports used for transmission in each physical resource block pair whenthe E-PDCCH is transmitted by using at least one second resource groupof the second type.

In an optional implementation manner of this embodiment, when a quantityof at least one second resource group of the second type used fortransmitting the E-PDCCH is greater than a preset quantity threshold,two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the firstdetermining unit 21 is specifically configured to determine that eachsecond resource group of the first type corresponds to two firstresource groups, and determine that a port set corresponding to the twofirst resource groups corresponding to the second resource group of thefirst type in the foregoing mapping relationship between the firstresource groups and the pilot ports includes two different pilot ports,where the two different pilot ports are respectively a first pilot portand a second pilot port, or are respectively a third pilot port and afourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes four second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to two first resource groups corresponding to two secondresource groups of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are uniformly a first pilot port and a secondpilot port; and two different pilot ports included in a port setcorresponding to two first resource groups corresponding to the othertwo second resource groups of the first type included in the physicalresource block pair in the foregoing mapping relationship between thefirst resource groups and the pilot ports are uniformly a third pilotport and a fourth pilot port.

In the four second resource groups of the first type included in thephysical resource block pair, for two second resource groups of thefirst type corresponding to two first resource groups corresponding tothe pilot set including the first pilot port and second pilot port, thetwo first resource groups in the two second resource groups of the firsttype are arranged in different sequences according to the pilot ports;and for two second resource groups of the first type corresponding totwo first resource groups corresponding to the pilot set including thethird pilot port and fourth pilot port, the two first resource groups inthe two second resource groups of the first type are arranged indifferent sequences according to the pilot ports.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the firstdetermining unit 21 is specifically configured to determine that eachsecond resource group of the first type corresponds to four firstresource groups, and that a port set corresponding to the four firstresource groups corresponding to the second resource group of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes four different pilot ports, wherethe four different pilot ports are respectively a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Four different pilot ports included in a port setcorresponding to four first resource groups corresponding to the twosecond resource groups of the first type included in a physical resourceblock pair in the foregoing mapping relationship between the firstresource groups and the pilot ports are uniformly a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port, and thefour first resource groups in the two second resource groups of thefirst type included in the physical resource block pair are arranged indifferent sequences according to the pilot ports.

Manners of arranging pilot ports in the two second resource groups ofthe first type included in the physical resource block pair include butare not limited to the following: an arrangement of pilot ports in onesecond resource group of the first type included in the physicalresource block pair is the first pilot port, the second pilot port, thethird pilot port, and the fourth pilot port, but an arrangement of pilotports in the other second resource group of the first type included inthe physical resource block pair is the second pilot port, the firstpilot port, the fourth pilot port, and the third pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the second pilot port, the third pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe fourth pilot port, the third pilot port, the second pilot port, andthe first pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the third pilot port, the second pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe third pilot port, the first pilot port, the fourth pilot port, andthe second pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the firstdetermining unit 21 is specifically configured to determine that eachsecond resource group of the first type corresponds to four firstresource groups, and that a port set corresponding to the four firstresource groups corresponding to the second resource group of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes two different pilot ports, where thetwo different pilot ports are respectively a first pilot port and asecond pilot port, or are respectively a third pilot port and a fourthpilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to four first resource groups corresponding to one secondresource group of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are a first pilot port and a second pilotport; and two different pilot ports included in a port set correspondingto four first resource groups corresponding to the other second resourcegroup of the first type included in the physical resource block pair inthe foregoing mapping relationship between the first resource groups andthe pilot ports are a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, the seconddetermining unit 22 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups located in different physical resource block pairs,corresponding to a same pilot port, and having a same position index.

In an optional implementation manner of this embodiment, the seconddetermining unit 22 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups located in different physical resource block pairs,corresponding to a same pilot port, and having different positionindexes.

In an optional implementation manner of this embodiment, on a basis ofimplementation of second resource groups of the first type, the seconddetermining unit 22 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups that are located in different physical resource blockpairs and have position indexes same as position indexes of at least twofirst resource groups corresponding to the second resource groups of thefirst type.

In an optional implementation manner of this embodiment, the first pilotport is a DMRS port 7, the second pilot port is a DMRS port 9, the thirdpilot port is a DMRS port 8, and the fourth pilot port is a DMRS port10; or the first pilot port is the DMRS port 8, the second pilot port isthe DMRS port 10, the third pilot port is the DMRS port 7, and thefourth pilot port is the DMRS port 9; or the first pilot port is theDMRS port 7, the second pilot port is the DMRS port 8, the third pilotport is the DMRS port 9, and the fourth pilot port is the DMRS port 10;or the first pilot port is the DMRS port 9, the second pilot port is theDMRS port 10, the third pilot port is the DMRS port 7, and the fourthpilot port is the DMRS port 8.

In an optional implementation manner of this embodiment, the basestation in this embodiment further includes a first obtaining unit 24.The first obtaining unit 24 is configured to predefine the mappingrelationship between the first resource groups and the pilot portsbefore the first determining unit 21 uses the mapping relationshipbetween the first resource groups and the pilot ports; or the firstobtaining unit 24 is configured to generate the mapping relationshipbetween the first resource groups and the pilot ports according to alocal cell identity before the first determining unit 21 uses themapping relationship between the first resource groups and the pilotports.

In an optional implementation manner of this embodiment, the basestation in this embodiment further includes a first sending unit 25. Thefirst sending unit 25 is configured to send higher layer signaling,where the higher layer signaling includes the mapping relationshipbetween the first resource groups and the pilot ports. The first sendingunit 25 is mainly configured to provide the mapping relationship betweenthe first resource groups and the pilot ports for a UE. Optionally, thefirst sending unit 25 is connected to the first determining unit 21 andthe first obtaining unit 24.

The functional units of the E-PDCCH transmission base station providedby this embodiment may be configured to execute the procedure of theforegoing E-PDCCH transmission method. Specific operating principlesthereof are not further described. For details, refer to the descriptionof the method embodiment.

The E-PDCCH transmission base station in this embodiment determines thecorrespondence between the second resource groups of the first type andthe first resource groups and pilot ports, and the correspondencebetween the second resource groups of the second type and the firstresource groups and pilot ports respectively according to the mappingrelationship between the first resource groups and the pilot ports andaccording to the specific relationship, and then determines at least onesecond resource group of the first type or at least one second resourcegroup of the second type used for transmitting the E-PDCCH, and maps,according to the previously determined correspondence between the secondresource groups of the first type or second type and the first resourcegroups and pilot ports, the second resource group of the first type orsecond type used for transmitting the E-PDCCH, to at least one firstresource group and pilot port, thereby resolving an E-PDCCH transmissionproblem. Further, the E-PDCCH transmission base station in thisembodiment can also improve utilization of pilot ports, and implementspace diversity.

FIG. 2B is a schematic structural diagram of a UE according to anembodiment of the present invention. As shown in FIG. 2B, the UE in thisembodiment includes a third determining unit 26, a fourth determiningunit 27, and a first receiving unit 28.

The third determining unit 26 is configured to determine acorrespondence between second resource groups of a first type and firstresource groups and pilot ports, and a correspondence between secondresource groups of a second type and first resource groups and pilotports according to a mapping relationship between the first resourcegroups and the pilot ports and according to a specific relationship.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport. The first resource groups are eREGs or REGs, the second resourcegroups of the first type are eCCEs or control channel candidates, thesecond resource groups of the second type are eCCEs or control channelcandidates, and the physical resource element set is at least onephysical resource block pair. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. A correspondence between second resource groups of differenttypes and the first resource groups and pilot port satisfies theforegoing specific relationship.

The fourth determining unit 27 is configured to determine at least onesecond resource group of the first type or second resource group of thesecond type used for transmitting an E-PDCCH.

The first receiving unit 28 is connected to the third determining unit26 and the fourth determining unit 27, and configured to receive,according to the correspondence between the second resource groups ofthe first type or second type and the first resource groups and pilotports that is determined by the third determining unit 26, the at leastone second resource group of the first type or second resource group ofthe second type that is used for transmitting the E-PDCCH and isdetermined by the fourth determining unit 27, on at least one firstresource group and pilot port.

In an optional implementation manner of this embodiment, the secondresource groups of the first type are resource groups for transmittingthe E-PDCCH in localized mode, and the second resource groups of thesecond type are resource groups for transmitting the E-PDCCH indistributed mode.

In an optional implementation manner of this embodiment, that the thirddetermining unit 26 determines a correspondence between second resourcegroups of a first type and first resource groups and pilot portsaccording to a mapping relationship between the first resource groupsand the pilot ports and according to a specific relationship includesthat: the third determining unit 26 is specifically configured todetermine, according to the mapping relationship between the firstresource groups and the pilot ports and according to the specificrelationship, that a port set corresponding to at least two firstresource groups corresponding to the second resource groups of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes at least two different pilot ports,and determine that a pilot port used for transmission by each secondresource group of the first type is a pilot port corresponding to thefirst or last one of the at least two first resource groupscorresponding to the second resource groups of the first type.

In an optional implementation manner of this embodiment, that the thirddetermining unit 26 determines that a port set corresponding to at leasttwo first resource groups corresponding to the second resource groups ofthe first type in the foregoing mapping relationship between the firstresource groups and the pilot ports includes at least two differentpilot ports, includes that: the third determining unit 26 is morespecifically configured to determine that the at least two differentpilot ports that are included in the port set corresponding to the atleast two first resource groups corresponding to the second resourcegroups of the first type in the foregoing mapping relationship betweenthe first resource groups and the pilot ports are at least two pilotports used for transmission in each physical resource block pair whenthe E-PDCCH is transmitted by using at least one second resource groupof the second type.

In an optional implementation manner of this embodiment, when a quantityof at least one second resource group of the second type used fortransmitting the E-PDCCH is greater than a preset quantity threshold,two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the thirddetermining unit 26 is specifically configured to determine that eachsecond resource group of the first type corresponds to two firstresource groups, and determine that a port set corresponding to the twofirst resource groups corresponding to the second resource group of thefirst type in the foregoing mapping relationship between the firstresource groups and the pilot ports includes two different pilot ports,where the two different pilot ports are respectively a first pilot portand a second pilot port, or are respectively a third pilot port and afourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes four second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to two first resource groups corresponding to two secondresource groups of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are uniformly a first pilot port and a secondpilot port; and two different pilot ports included in a port setcorresponding to two first resource groups corresponding to the othertwo second resource groups of the first type included in the physicalresource block pair in the foregoing mapping relationship between thefirst resource groups and the pilot ports are uniformly a third pilotport and a fourth pilot port.

In the four second resource groups of the first type included in thephysical resource block pair, for two second resource groups of thefirst type corresponding to two first resource groups corresponding tothe pilot set including the first pilot port and second pilot port, thetwo first resource groups in the two second resource groups of the firsttype are arranged in different sequences according to the pilot ports;and for two second resource groups of the first type corresponding totwo first resource groups corresponding to the pilot set including thethird pilot port and fourth pilot port, the two first resource groups inthe two second resource groups of the first type are arranged indifferent sequences according to the pilot ports.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the thirddetermining unit 26 is specifically configured to determine that eachsecond resource group of the first type corresponds to four firstresource groups, and that a port set corresponding to the four firstresource groups corresponding to the second resource group of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes four different pilot ports, wherethe four different pilot ports are respectively a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Four different pilot ports included in a port setcorresponding to four first resource groups corresponding to the twosecond resource groups of the first type included in a physical resourceblock pair in the foregoing mapping relationship between the firstresource groups and the pilot ports are uniformly a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port, and thefour first resource groups in the two second resource groups of thefirst type included in the physical resource block pair are arranged indifferent sequences according to the pilot ports.

Manners of arranging pilot ports in the two second resource groups ofthe first type included in the physical resource block pair include butare not limited to the following: an arrangement of pilot ports in onesecond resource group of the first type included in the physicalresource block pair is the first pilot port, the second pilot port, thethird pilot port, and the fourth pilot port, but an arrangement of pilotports in the other second resource group of the first type included inthe physical resource block pair is the second pilot port, the firstpilot port, the fourth pilot port, and the third pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the second pilot port, the third pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe fourth pilot port, the third pilot port, the second pilot port, andthe first pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the third pilot port, the second pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe third pilot port, the first pilot port, the fourth pilot port, andthe second pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the thirddetermining unit 26 is specifically configured to determine that eachsecond resource group of the first type corresponds to four firstresource groups, and that a port set corresponding to the four firstresource groups corresponding to the second resource group of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports includes two different pilot ports, where thetwo different pilot ports are respectively a first pilot port and asecond pilot port, or are respectively a third pilot port and a fourthpilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to four first resource groups corresponding to one secondresource group of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are a first pilot port and a second pilotport; and two different pilot ports included in a port set correspondingto four first resource groups corresponding to the other second resourcegroup of the first type included in the physical resource block pair inthe foregoing mapping relationship between the first resource groups andthe pilot ports are a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, the fourthdetermining unit 27 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups located in different physical resource block pairs,corresponding to a same pilot port, and having a same position index.

In an optional implementation manner of this embodiment, the fourthdetermining unit 27 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups located in different physical resource block pairs,corresponding to a same pilot port, and having different positionindexes.

In an optional implementation manner of this embodiment, on a basis ofimplementation of second resource groups of the first type, the fourthdetermining unit 27 is specifically configured to determine that atleast two first resource groups corresponding to each second resourcegroup of the second type used for transmitting the E-PDCCH are firstresource groups that are located in different physical resource blockpairs and have position indexes same as position indexes of at least twofirst resource groups corresponding to the second resource groups of thefirst type.

In an optional implementation manner of this embodiment, the first pilotport is a DMRS port 7, the second pilot port is a DMRS port 9, the thirdpilot port is a DMRS port 8, and the fourth pilot port is a DMRS port10; or the first pilot port is the DMRS port 8, the second pilot port isthe DMRS port 10, the third pilot port is the DMRS port 7, and thefourth pilot port is the DMRS port 9; or the first pilot port is theDMRS port 7, the second pilot port is the DMRS port 8, the third pilotport is the DMRS port 9, and the fourth pilot port is the DMRS port 10;or the first pilot port is the DMRS port 9, the second pilot port is theDMRS port 10, the third pilot port is the DMRS port 7, and the fourthpilot port is the DMRS port 8.

In an optional implementation manner of this embodiment, the UE in thisembodiment further includes a second obtaining unit 29. The secondobtaining unit 29 is configured to predefine the mapping relationshipbetween the first resource groups and the pilot ports before the thirddetermining unit 26 uses the mapping relationship between the firstresource groups and the pilot ports; or the second obtaining unit 29 isconfigured to generate the mapping relationship between the firstresource groups and the pilot ports according to a local cell identitybefore the third determining unit 26 uses the mapping relationshipbetween the first resource groups and the pilot ports.

In an optional implementation manner of this embodiment, the firstreceiving unit 28 is further configured to receive higher layersignaling, where the higher layer signaling includes the mappingrelationship between the first resource groups and the pilot ports. Thefirst receiving unit 28 is specifically configured to receive higherlayer signaling sent by a base station.

The functional units of the UE provided by this embodiment may beconfigured to execute the corresponding procedure of the E-PDCCHreception method shown in FIG. 1B. The specific operating principlesthereof are not further described herein. For details, refer to thedescription of the method embodiment.

The UE provided by this embodiment cooperates with the E-PDCCHtransmission base station provided by the foregoing embodiment tocomplete E-PDCCH transmission, and in addition, improves utilization ofreference signal resources, and fully uses space diversity provided bythe pilot ports.

FIG. 3A is a schematic structural diagram of a base station according toanother embodiment of the present invention. As shown in FIG. 3A, thebase station in this embodiment includes a processor 31 and atransmitter 32.

The processor 31 is configured to determine a correspondence betweensecond resource groups of a first type and first resource groups andpilot ports, and a correspondence between second resource groups of asecond type and first resource groups and pilot ports according to amapping relationship between the first resource groups and the pilotports and according to a specific relationship, and determine at leastone second resource group of the first type or second resource group ofthe second type used for transmitting an E-PDCCH.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport. The first resource groups are eREGs or REGs, the second resourcegroups of the first type are eCCEs or control channel candidates, andthe second resource groups of the second type are eCCEs or controlchannel candidates. The physical resource element set is at least onephysical resource block pair. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. A correspondence between second resource groups of differenttypes and the first resource groups and pilot port satisfies theforegoing specific relationship.

The transmitter 32 is configured to map, according to the correspondencebetween the second resource groups of the first type or second type andthe first resource groups and pilot ports that is determined by theprocessor 31, the at least one second resource group of the first typeor second resource group of the second type used for transmitting theE-PDCCH and is determined by the processor 31, to at least one firstresource group and pilot port for transmission.

In an optional implementation manner of this embodiment, the secondresource groups of the first type are resource groups for transmittingthe E-PDCCH in localized mode, and the second resource groups of thesecond type are resource groups for transmitting the E-PDCCH indistributed mode.

In an optional implementation manner of this embodiment, that theprocessor 31 determines a correspondence between second resource groupsof a first type and first resource groups and pilot ports according to amapping relationship between the first resource groups and the pilotports and according to a specific relationship includes that: theprocessor 31 is specifically configured to determine, according to themapping relationship between the first resource groups and the pilotports and according to the specific relationship, that a port setcorresponding to at least two first resource groups corresponding to thesecond resource groups of the first type in the foregoing mappingrelationship between the first resource groups and the pilot portsincludes at least two different pilot ports, and determine that a pilotport used for transmission by each second resource group of the firsttype is a pilot port corresponding to the first or last one of the atleast two first resource groups corresponding to the second resourcegroups of the first type.

In an optional implementation manner of this embodiment, that theprocessor 31 determines that a port set corresponding to at least twofirst resource groups corresponding to the second resource groups of thefirst type in the foregoing mapping relationship between the firstresource groups and the pilot ports includes at least two differentpilot ports, includes that: the processor 31 is more specificallyconfigured to determine that the at least two different pilot ports thatare included in the port set corresponding to the at least two firstresource groups corresponding to the second resource groups of the firsttype in the foregoing mapping relationship between the first resourcegroups and the pilot ports are at least two pilot ports used fortransmission in each physical resource block pair when the E-PDCCH istransmitted by using at least one second resource group of the secondtype.

In an optional implementation manner of this embodiment, when a quantityof at least one second resource group of the second type used fortransmitting the E-PDCCH is greater than a preset quantity threshold,two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport for, or a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the processor 31 isspecifically configured to determine that each second resource group ofthe first type corresponds to two first resource groups, and determinethat a port set corresponding to the two first resource groupscorresponding to the second resource group of the first type in theforegoing mapping relationship between the first resource groups and thepilot ports includes two different pilot ports, where the two differentpilot ports are respectively a first pilot port and a second pilot port,or are respectively a third pilot port and a fourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes four second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to two first resource groups corresponding to two secondresource groups of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are uniformly a first pilot port and a secondpilot port; and two different pilot ports included in a port setcorresponding to two first resource groups corresponding to the othertwo second resource groups of the first type included in the physicalresource block pair in the foregoing mapping relationship between thefirst resource groups and the pilot ports are uniformly a third pilotport and a fourth pilot port.

In the four second resource groups of the first type included in thephysical resource block pair, for two second resource groups of thefirst type corresponding to two first resource groups corresponding tothe pilot set including the first pilot port and second pilot port, thetwo first resource groups in the two second resource groups of the firsttype are arranged in different sequences according to the pilot ports;and for two second resource groups of the first type corresponding totwo first resource groups corresponding to the pilot set including thethird pilot port and fourth pilot port, the two first resource groups inthe two second resource groups of the first type are arranged indifferent sequences according to the pilot ports.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the processor 31 isspecifically configured to determine that each second resource group ofthe first type corresponds to four first resource groups, and that aport set corresponding to the four first resource groups correspondingto the second resource group of the first type in the foregoing mappingrelationship between the first resource groups and the pilot portsincludes four different pilot ports, where the four different pilotports are respectively a first pilot port, a second pilot port, a thirdpilot port, and a fourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Four different pilot ports included in a port setcorresponding to four first resource groups corresponding to the twosecond resource groups of the first type included in a physical resourceblock pair in the foregoing mapping relationship between the firstresource groups and the pilot ports are uniformly a first pilot port, asecond pilot port, a third pilot port, and a fourth pilot port, and thefour first resource groups in the two second resource groups of thefirst type included in the physical resource block pair are arranged indifferent sequences according to the pilot ports.

Manners of arranging pilot ports in the two second resource groups ofthe first type included in the physical resource block pair include butare not limited to the following: an arrangement of pilot ports in onesecond resource group of the first type included in the physicalresource block pair is the first pilot port, the second pilot port, thethird pilot port, and the fourth pilot port, but an arrangement of pilotports in the other second resource group of the first type included inthe physical resource block pair is the second pilot port, the firstpilot port, the fourth pilot port, and the third pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the second pilot port, the third pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe fourth pilot port, the third pilot port, the second pilot port, andthe first pilot port; or

an arrangement of pilot ports in one second resource group of the firsttype included in the physical resource block pair is the first pilotport, the third pilot port, the second pilot port, and the fourth pilotport, but an arrangement of pilot ports in the other second resourcegroup of the first type included in the physical resource block pair isthe third pilot port, the first pilot port, the fourth pilot port, andthe second pilot port.

In an optional implementation manner of this embodiment, on a basis ofthe foregoing description, that is, when a quantity of at least onesecond resource group of the second type used for transmitting theE-PDCCH is greater than a preset quantity threshold, under a conditionthat two pilot ports are used for transmission in each physical resourceblock pair, which are respectively a first pilot port and a second pilotport, or a third pilot port and a fourth pilot port, the processor 31 isspecifically configured to determine that each second resource group ofthe first type corresponds to four first resource groups, and that aport set corresponding to the four first resource groups correspondingto the second resource group of the first type in the foregoing mappingrelationship between the first resource groups and the pilot portsincludes two different pilot ports, where the two different pilot portsare respectively a first pilot port and a second pilot port, or arerespectively a third pilot port and a fourth pilot port.

On a basis of the foregoing description, each physical resource blockpair includes two second resource groups of the first type. In thiscase, each physical resource block pair includes eight first resourcegroups in total. Two different pilot ports included in a port setcorresponding to four first resource groups corresponding to one secondresource group of the first type included in a physical resource blockpair in the foregoing mapping relationship between the first resourcegroups and the pilot ports are a first pilot port and a second pilotport; and two different pilot ports included in a port set correspondingto four first resource groups corresponding to the other second resourcegroup of the first type included in the physical resource block pair inthe foregoing mapping relationship between the first resource groups andthe pilot ports are a third pilot port and a fourth pilot port.

In an optional implementation manner of this embodiment, the processor31 is specifically configured to determine that at least two firstresource groups corresponding to each second resource group of thesecond type used for transmitting the E-PDCCH are first resource groupslocated in different physical resource block pairs, corresponding to asame pilot port, and having a same position index.

In an optional implementation manner of this embodiment, the processor31 is specifically configured to determine that at least two firstresource groups corresponding to each second resource group of thesecond type used for transmitting the E-PDCCH are first resource groupslocated in different physical resource block pairs, corresponding to asame pilot port, and having different position indexes.

In an optional implementation manner of this embodiment, on a basis ofimplementation of second resource groups of the first type, theprocessor 31 is specifically configured to determine that at least twofirst resource groups corresponding to each second resource group of thesecond type used for transmitting the E-PDCCH are first resource groupsthat are located in different physical resource block pairs and haveposition indexes same as position indexes of at least two first resourcegroups corresponding to the second resource groups of the first type.

In an optional implementation manner of this embodiment, the first pilotport is a DMRS port 7, the second pilot port is a DMRS port 9, the thirdpilot port is a DMRS port 8, and the fourth pilot port is a DMRS port10; or the first pilot port is the DMRS port 8, the second pilot port isthe DMRS port 10, the third pilot port is the DMRS port 7, and thefourth pilot port is the DMRS port 9; or the first pilot port is theDMRS port 7, the second pilot port is the DMRS port 8, the third pilotport is the DMRS port 9, and the fourth pilot port is the DMRS port 10;or the first pilot port is the DMRS port 9, the second pilot port is theDMRS port 10, the third pilot port is the DMRS port 7, and the fourthpilot port is the DMRS port 8.

In an optional implementation manner of this embodiment, the transmitter32 is further configured to send higher layer signaling, where thehigher layer signaling includes the mapping relationship between thefirst resource groups and the pilot ports. Specifically, the transmitter32 is configured to transmit higher layer signaling to a UE to providethe foregoing mapping relationship between the first resource groups andthe pilot ports for the UE.

In an optional implementation manner of this embodiment, the processor31 is further configured to predefine the mapping relationship betweenthe first resource groups and the pilot ports before the processor 31uses the mapping relationship between the first resource groups and thepilot ports; or the processor 31 is further configured to generate themapping relationship between the first resource groups and the pilotports according to a local cell identity before the processor 31 usesthe mapping relationship between the first resource groups and the pilotports.

The base station provided by this embodiment may be configured toexecute the procedure of the foregoing E-PDCCH transmission method.Specific operating principles thereof are not further described. Fordetails, refer to the description of the method embodiment.

The base station in this embodiment determines the correspondencebetween the second resource groups of the first type and the firstresource groups and pilot ports, and the correspondence between thesecond resource groups of the second type and the first resource groupsand pilot ports respectively according to the mapping relationshipbetween the first resource groups and the pilot ports and according tothe specific relationship, and then determines at least one secondresource group of the first type or at least one second resource groupof the second type used for transmitting the E-PDCCH, and maps,according to the previously determined correspondence between the secondresource groups of the first type or second type and the first resourcegroups and pilot ports, the second resource group of the first type orsecond type used for transmitting the E-PDCCH, to at least one firstresource group and pilot port for transmission, thereby solving anE-PDCCH transmission problem. Further, the E-PDCCH transmission basestation in this embodiment can also improve utilization of pilot ports,and implement space diversity.

FIG. 3B is a schematic structural diagram of a UE according to anotherembodiment of the present invention. As shown in FIG. 3B, the UE in thisembodiment includes a processor 35 and a receiver 36.

The processor 35 is configured to determine a correspondence betweensecond resource groups of a first type and first resource groups andpilot ports, and a correspondence between second resource groups of asecond type and first resource groups and pilot ports according to amapping relationship between the first resource groups and the pilotports and according to a specific relationship, and determine at leastone second resource group of the first type or second resource group ofthe second type used for transmitting an E-PDCCH.

The mapping relationship between the first resource groups and the pilotports includes a mapping relationship between at least one firstresource group in a physical resource element set and at least one pilotport. The first resource groups are eREGs or REGs, the second resourcegroups of the first type are eCCEs or control channel candidates, thesecond resource groups of the second type are eCCEs or control channelcandidates, and the physical resource element set is at least onephysical resource block pair. A second resource group of the first typecorresponds to at least two first resource groups, and a second resourcegroup of the second type corresponds to at least two first resourcegroups. A correspondence between second resource groups of differenttypes and the first resource groups and pilot port satisfies theforegoing specific relationship.

The receiver 36 is configured to receive, according to thecorrespondence between the second resource groups of the first type orsecond type and the first resource groups and pilot ports that isdetermined by the processor 35, the at least one second resource groupof the first type or second resource group of the second type used fortransmitting the E-PDCCH and is determined by the processor 35, on atleast one first resource group and pilot port.

The UE provided by this embodiment may be configured to execute theprocedure of the E-PDCCH reception method provided by the foregoingembodiment. For specific operating principles and other functionsthereof, refer to the description of the foregoing method embodiment,and no further description is provided herein.

The UE provided by this embodiment cooperates with the base stationprovided by the foregoing embodiment to complete E-PDCCH transmission,and in addition, may also improve utilization of pilot ports, andimplement space diversity.

FIG. 4A is a flowchart of an E-PDCCH transmission method according to anembodiment of the present invention. This embodiment may be executed bya base station, and may also by a UE. That is, a UE cooperates with abase station to number second resource groups of a first type and secondresource groups of a second type by using a same manner, so as tofacilitate E-PDCCH transmission and improve blind detection efficiency.As shown in FIG. 4A, the transmission method in this embodimentincludes:

Step 401: In a physical resource block set, separately arrange firstresource groups in each PRB pair, where the first resource groups areeREGs or REGs, and the physical resource block set includes at least oneof the physical resource block pairs.

In this embodiment, the physical resource block set includes at leastone physical resource block pair. The first resource groups in thephysical resource block set include first resource groups in eachphysical resource block pair in the physical resource block set. Thefirst resource groups in the physical resource block set are arrangedsequentially according to a sequence of the physical resource blockpairs, and a number of each arranged first resource group is obtained.

As shown in FIG. 14, assuming that the physical resource block setincludes four physical resource block pairs, where one PRB pair includesL eREGs, for example, L=16, for ai, i=1 to 16, a1 to a16 correspond toindexes of the eREGs, and values of a1 to a16 are numbers that aredifferent from each other in a range of 0 to 15. In each PRB pair in asame control channel resource block set, L eREGs are grouped into same KeREG groups. If K=4, 16 eREGs are grouped into four eREG groups.

In eCCEs for transmitting an E-PDCCH in localized mode, each eCCEcorresponds to one REG group. A dotted line box in FIG. 14 shows an eCCEfor transmitting the E-PDCCH in localized mode. As shown in FIG. 14, ina PRB pair, four eCCEs are respectively corresponding to the four REGgroups. A first eREG group (an eREG group 1) includes (eREG (a1), eREG(a2), eREG (a3), and eREG (a4)); a second eREG group (an eREG group 2)includes (eREG (a5), eREG (a6), eREG (a7) and eREG (a8)); a third eREGgroup (an eREG group 3) includes (eREG (a9), eREG (a10), eREG (a11), andeREG (a12)); and a fourth eREG group (an eREG group 4) includes (eREG(a13), eREG (a14), eREG (a15), and eREG (a16)).

The foregoing eREG group grouping manner is used in each PRB pair in asame control channel resource block set. For different PRB pairs, ineach eREG group that includes same eREGs, the eREGs are arranged indifferent sequences. For example, for the same eREG group 1 thatincludes same elements (eREG (a1), eREG (a2), eREG (a3), and eREG (a4)),an arrangement sequence in PRB pair 1 is (eREG (a1), eREG (a2), eREG(a3), and eREG (a4)), an arrangement sequence in PRB pair 2 is (eREG(a2), eREG (a3), eREG (a4), and eREG (a1)), an arrangement sequence inPRB pair 3 is (eREG (a3), eREG (a4), eREG (a1), and eREG (a2)), and anarrangement sequence in PRB pair 4 is (eREG (a4), eREG (a1), eREG (a2),and eREG (a3)). An arrangement sequence may also be a cyclic shift ofdifferent PRB pairs. A similar arrangement manner may also be used forother eREG groups, which is not further described herein.

By using the foregoing manner, eCCEs for transmitting the E-PDCCH inlocalized mode are obtained.

Each eCCE for transmitting the E-PDCCH in distributed mode maycorrespond to each row in FIG. 14, that is, from an eREG group includingsame eREG elements in each PRB pair, a different eREG element isselected to constitute an eCCE for transmitting the E-PDCCH indistributed mode. A solid line box in FIG. 14 shows an eCCE fortransmitting the E-PDCCH in distributed mode. For example, an eREG groupincluding same eREG elements (eREG (a1), eREG (a2), eREG (a3), and eREG(a4)) in each PRB pair is referred to as an eREG group 1, and from theeREG group 1 in different PRB pairs, a different element is separatelyselected to constitute an eCCE for transmitting the E-PDCCH indistributed mode. For example, eREG (a1) selected from the eREG group 1in the PRB pair 1, eREG (a2) selected from the eREG group 1 in the PRBpair 2, eREG (a3) selected from the eREG group 1 in the PRB pair 3, andeREG (a4) selected from the eREG group 1 in the PRB pair 4, that is, aset of all eREGs in a first row in FIG. 14, constitute an eCCE fortransmitting the E-PDCCH in distributed mode; eREG (a2) selected fromthe eREG group 1 in the PRB pair 1, eREG (a3) selected from the eREGgroup 1 in the PRB pair 2, eREG (a4) selected from the eREG group 1 inthe PRB pair 3, and eREG (a1) selected from the eREG group 1 in the PRBpair 4, that is, a set of all eREGs in a second row in FIG. 14,constitute another eCCE for transmitting the E-PDCCH in distributedmode; and similarly, each row in FIG. 14 is circled to constitute aneCCE for transmitting the E-PDCCH in distributed mode. This manner mayalso be understood as selecting an eREG with a different numbercorresponding to an eREG element included in a localized eCCE from eachPRB pair to constitute an eCCE for transmitting the E-PDCCH indistributed mode.

The following form may be used as a form of numbers of eREGscorresponding to a1-a16 in the FIG. 14:

a1, a2, a3, and a4 respectively correspond to eREG numbers 0, 4, 8, and12;

a5, a6, a7, and a8 respectively correspond to eREG numbers 1, 5, 9, and13;

a9, a10, a11, and a12 respectively correspond to eREG numbers 2, 6, 10,14; and

a13, a14, a15, and a16 respectively correspond to eREG numbers 3, 9, 11,and 15.

The specific resource set may be a set including L*B eREGs in size,where M is a quantity of eREGs included in each eCCE, B is a quantity ofPRB pairs, and the set of B*M eREGs is a set including indexes of only BeREGs.

The form of distributed and localized eCCEs for the E-PDCCH has beendetermined in the foregoing manner. On a basis of the foregoingprinciple, the eCCEs need to be numbered. A purpose of eCCE numberingis: first, a correspondence between logical eCCEs and physical eCCEsneeds to be determined, so that the logical eCCEs are mapped to thephysical eCCEs, or composition of a search scope may be determined, anda resource binding relationship in HARQ feedback needs to be associatedwith eCCE indexes.

Step 402: Number second resource groups according to a correspondencebetween the first resource groups and the second resource groups in thephysical resource block set, where the second resource groups arecontrol channel element eCCE groups or control channel candidates.

Preferably, for the second resource groups of a first type (for example,the eCCEs for transmitting the E-PDCCH in localized mode), any one ofthe following manners may be used for numbering the second resourcegroups:

Manner 1:

Each of the physical resource block pairs includes N third resourcegroups, where N is a positive integer, and each of the third resourcegroups includes M first resource groups, and in the physical resourceblock set, a number set of first resource groups included in each thirdresource group in a physical resource block pair is the same as a numberset of first resource groups included in a third resource group in eachof other physical resource block pairs; and the numbering secondresource groups according to a correspondence between the first resourcegroups and the second resource groups in the physical resource block setincludes that: each of the third resource groups corresponds to one ofthe second resource groups of the first type, and the second resourcegroups of the first type in each physical resource block pair arenumbered sequentially in ascending or descending order of numbers of thephysical resource block pairs, where a correspondence between numbers ofthe second resource groups of the first type and numbers of firstresource groups corresponding to the second resource groups of the firsttype exists in each physical resource block pair.

Optionally, that a correspondence between numbers of the second resourcegroups of the first type and numbers of first resource groupscorresponding to the second resource groups of the first type exists ineach physical resource block pair includes that: in each physicalresource block pair, the numbers of the second resource groups of thefirst type are consecutive, and a sequence of the numbers of the secondresource groups of the first type is the same as a sequence of maximumnumbers or minimum numbers of the first resource groups corresponding tothe second resource groups of the first type.

In a preferred implementation manner of the present invention, manner 1may include that:

the numbering second resource groups according to a correspondencebetween the first resource groups and the second resource groups in thephysical resource block set includes that: determining the numbers ofthe second resource groups of the first type according to the followingformula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

For example, for the eCCEs for transmitting the control channel inlocalized mode, a numbering rule thereof may be numbering all eCCEs ineach PRB pair sequentially from the first PRB pair, and then numberingall eCCEs in a next PRB pair. A sequence of numbering eCCEs in each PRBpair is an arrangement in ascending order of minimum numbers of eREGsincluded in each eCCE. For example, in a PRB pair, numbers of eREGsincluded in an eCCE are 0, 4, 8, and 12, and numbers of eREGs includedin another eCCE are 1, 5, 9, and 13; a minimum number of an eREGincluded in the first eCCE is 0, and a minimum number of an eREGincluded in the another eCCE is 1. In this case, the eCCE including theeREG with the minimum number of 0 may be numbered before the eCCEincluding the eREG with the minimum number of 1. A final numberingmanner using the method in this embodiment is shown in FIG. 4B. In FIG.4B, each circle represents an eCCE, and a number in the circlerepresents the number of the eCCE. Manners of arranging eREGs in FIG. 4Bto FIG. 4E are the same as those in FIG. 14.

Manner 2:

Each of the physical resource block pairs includes N third resourcegroups, where N is a positive integer, and each of the third resourcegroups includes M first resource groups; in the physical resource blockset, a number set of first resource groups included in each thirdresource group in a physical resource block pair is the same as a numberset of first resource groups included in a third resource group in eachof other physical resource block pairs; in each of the physical resourceblock pairs, a sequence of numbers of the third resource groups is thesame as a sequence of maximum numbers or minimum numbers of the firstresource groups in the third resource groups; and the numbering secondresource groups according to a correspondence between the first resourcegroups and the second resource groups in the physical resource block setincludes that: each of the third resource groups corresponds to one ofthe second resource groups of the first type, and the second resourcegroups of the first type corresponding to third resource groups having asame number are numbered sequentially in ascending or descending orderof the numbers of the third resource groups, where a correspondencebetween a sequence of numbers of the second resource groups of the firsttype and a sequence of numbers of physical resource block pairs in whichthe second resource groups of the first type are located, exists in thesecond resource groups of the first type corresponding to the thirdresource groups having the same number.

Optionally, that a correspondence between a sequence of numbers of thesecond resource groups of the first type and a sequence of numbers ofphysical resource block pairs in which the second resource groups of thefirst type are located, exists in the second resource groups of thefirst type corresponding to the third resource groups having the samenumber includes that: in the second resource groups of the first typecorresponding to the third resource groups having the same number, thenumbers of the second resource groups of the first type are consecutive,and the sequence of the numbers of the second resource groups of thefirst type is the same as the sequence of the numbers of the physicalresource block pairs in which the second resource groups of the firsttype are located.

In a preferred instance of the embodiment of the present invention,manner 2 may include:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

For example, for the eCCEs for transmitting the control channel inlocalized mode, a numbering rule thereof may be numbering a same eREGgroup in all PRB pairs sequentially from the first PRB pair, where thesame eREG group is an eREG group including same eREG elements in eachPRB pair, and then numbering a next eREG group. The eREG groups arenumbered in ascending order of PRB indexes (PRB numbers). For example,for the eREG group 1 in FIG. 14, the numbering is sequential numberingin a manner of first numbering the eREG group 1 in the PRB pair 1 andthen numbering the eREG group 1 in the PRB pair 2. The eREG group 2 isnumbered in the same manner. The numbering manner may be the mannershown in FIG. 4C. In FIG. 4C, each circle represents an eCCE fortransmitting the control channel in localized mode, and a number in thecircle represents the number of the eCCE.

Preferably, in the foregoing manner 1 and manner 2, for the secondresource groups of the first type corresponding to the third resourcegroups having the same number, a mapping relationship between the secondresource group of the first type in a physical resource block pair andfirst resource groups included in the second resource group of the firsttype in the physical resource block pair is a cyclic shift of a mappingrelationship between one of the second resource groups of the first typein each of the other physical resource block pairs and first resourcegroups included in the one of the second resource groups of the firsttype in each of the other physical resource block pairs.

Optionally, for the second resource groups of a second type (forexample, the eCCEs for transmitting the E-PDCCH in distributed mode),any one of the following methods may be used for numbering the secondresource groups:

Method 1:

Preferably, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set includes that: the secondresource groups of the second type include M first resource groups thatrespectively belong to different physical resource block pairs; andnumbers of first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type are usedas numbers of the second resource groups of the second type.

Optionally, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set includes:

determining the numbers of the second resource groups of the second typeaccording to the following formula:j=(i−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

determining the numbers of the second resource groups of the second typeaccording to the following formula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

For example, as shown in FIG. 4D, each circle represents a distributedeCCE, and a number in the circle represents the number of the eCCE. Anumbering manner may be that the number of each eCCE is the same as anumber of an eREG included in the eCCE in a specific PRB pair. Forexample, indexes of eREGs included in the eCCE in a first row in FIG.14, in four PRB pairs, are sequentially 0, 4, 8, and 10, and therefore,the index 0 of the eREG included in the eCCE in the PRB pair 1 is usedas the number of the eCCE.

Preferably, the physical resource block set includes K sets of thesecond resource groups of the second type, and in each set of the Ksets, a mapping relationship between one of the second resource groupsof the second type and first resource groups included in the one of thesecond resource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type.

Method 2:

The numbering second resource groups according to a correspondencebetween the first resource groups and the second resource groups in thephysical resource block set includes that: the second resource groups ofthe second type include M first resource groups that respectively belongto different physical resource block pairs, and the physical resourceblock set includes K sets of the second resource groups of the secondtype, where K is a positive integer, and in each set of the K sets, amapping relationship between one of the second resource groups of thesecond type and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type; in each set of the K sets, thesecond resource groups of the second type are numbered according tonumbers of first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type; andbetween different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same physicalresource block pair.

For example, as shown in FIG. 4E, each circle represents a distributedeCCE, and a number in the circle represents the number of the eCCE. Anumbering manner may be that numbering is first performed within an eCCEgroup. The eCCE group refers to a group of eCCEs. eREGs included in eacheCCE in the group have same numbers, but the numbers of the eREGs aredifferent in different PRB pairs. For example, the eCCE group 1 is foureCCEs corresponding to first four rows in FIG. 10. Each eCCE includeseREGs 0, 4, 8, and 12, but eREGs 0, 4, 8, and 12 in different eCCEs arelocated in different PRB pairs. First, eCCEs are numbered sequentiallyin each eCCE group, and a specific PRB pair is used as a basis of thesequence of numbers. For example, in a first PRB pair, eCCEs in whicheREGs are located are numbered in ascending order of indexes of eREGs ofeach eCCE in the PRB pair. Then eCCEs in a next eCCE group are numberedsequentially.

Preferably, if first resource groups corresponding to at least two ofthe second resource groups of the first type in the physical resourceblock set are the same as first resource groups corresponding to atleast two of the second resource groups of the second type in thephysical resource block set, a set of numbers of the at least two of thesecond resource groups of the first type is the same as a set of numbersof the at least two of the second resource groups of the second type.

For example, there is a correspondence between the foregoing numberingmanner of localized eCCEs and the numbering manner of distributed eCCEs.The correspondence may be: if the numbering manner of localized eCCEs ismanner 1, method 1 is used as the numbering manner of distributed eCCEs;if the numbering manner of localized eCCE is manner 2, method 2 is usedas the numbering manner of distributed eCCEs.

A principle of the foregoing correspondence is that: in a specificresource set, a number group including localized eCCEs is the same as anumber group including distributed eCCEs. For example, numbers oflocalized eCCEs included in resource sets in dotted line boxes in FIG.4B and FIG. 4D are respectively 0, 4, 8, and 12, and numbers ofdistributed eCCEs therein are also respectively 0, 4, 8, and 12.Likewise, numbers of localized eCCEs included in resource sets in dottedline boxes in FIG. 4C and FIG. 4E are respectively 0, 1, 2, and 3, andnumbers of distributed eCCEs therein are also respectively 0, 1, 2, and3.

Optionally, the second resource groups of the first type in the physicalresource block set are resource groups for transmitting the E-PDCCH inlocalized mode; and the second resource groups of the second type in thephysical resource block set are resource groups for transmitting theE-PDCCH in distributed mode.

Step 403: Determine numbers of the second resource groups fortransmitting an E-PDCCH, and map, according to the determined numbers,the E-PDCCH to the corresponding first resource groups for transmission.

As may be seen above, this embodiment implements numbering of the secondresource groups of the first type and the second resource groups of thesecond type, and is advantageous for blind detection.

For a case in which each eCCE includes four eREGs, an internal specificmapping sequence is not considered, and only cases of combinations areconsidered. There are the following four cases, and the eCCE may be aneCCE for transmission in localized mode or an eCCE for transmission indistributed mode:

eCCE X1 (eREG 0, eREG 4, eREG 8, and eREG 12),

eCCE X2 (eREG 1, eREG 5, eREG 9, and eREG13),

eCCE X3 (eREG 2, eREG 6, eREG 10, and eREG 14), and

eCCE X4 (eREG 3, eREG 7, eREG 11, and eREG 15).

When each eCCE includes eight eREGs, indexes of eREGs included in eCCEY1 may include a combination of indexes of eREGs included in eCCE X1 andeCCE X2, for example,

eCCE Y1 (eREG 0, eREG 4, eREG 8, eREG 12, eREG 1, eREG 5, eREG 9, andeREG 13); and

eCCE Y2 (eREG 2, eREG 6, eREG 10, eREG 14, eREG 3, eREG 7, eREG 11, andeREG 15).

In this case, when a CRS port quantity is 1, this combination may causea quantity of available REs included in eCCE Y1 to be closest to aquantity of available REs included in eCCE Y2. Both (eREG 0, eREG 4,eREG 8, and eREG 12) and (eREG2, eREG 6, eREG 10, and eREG 14) arealways in a subcarrier in which a pilot frequency is located, whichcauses the quantity of available REs to be less than (eREG 1, eREG 5,eREG 9, and eREG 13) and (eREG 3, eREG 7, eREG 11, and eREG 15); or

both (eREG 1, eREG 5, eREG 9, and eREG 13) and (eREG 3, eREG 7, eREG 11,and eREG 15) are always in a subcarrier in which a pilot frequency islocated, which causes the quantity of available REs to be less than(eREG 0, eREG 4, eREG 8, and eREG 12) and (eREG 2, eREG 6, eREG 10, andeREG 14). Therefore, eREGs that are all in a subcarrier in which a pilotfrequency is located must be decentralized to two eCCEs.

Alternatively, indexes of eREGs included in eCCE Y1 may include acombination of indexes of eREGs included in eCCE X1 and eCCE X2, forexample,

eCCE Y1 (eREG 0, eREG 4, eREG 8, eREG 12, eREG 2, eREG 6, eREG 10, andeREG 14); and

eCCE Y2 (eREG 1, eREG 5, eREG 9, eREG 13, eREG 3, eREG 7, eREG 11, andeREG 15).

For eCCEs for transmission in distributed mode, each eCCE includes eighteREGs, and a control channel resource set includes eight eREGs. In thiscase, there are two manners.

Manner 1:

The numbers of the eREGs included in the foregoing eCCE Y1 arerespectively mapped to eight eREGs sequentially in ascending order. Forexample, indexes of eREGs of eCCE 0 in Table 1 are (eREG 0, eREG 1, eREG4, eREG 5, eREG 8, eREG 9, eREG 12, and eREG 13) in eight PRB pairs; andnumbers of eREGs included in seven eCCEs are the same as those indexes,but are a cyclic shift of a mapping sequence of the eREGs of eCCE 0 indifferent PRB pairs. The cyclic shift is a sequence that is cyclicallyshifted sequentially. For example, a mapping sequence of eCCE 1 in eightPRB pairs is (eREG 1, eREG 4, eREG 5, eREG 8, eREG 9, eREG 12, eREG 13,and eREG 0).

Manner 2:

The numbers of the eREGs included in the foregoing eCCE Y1 are groupedinto two groups. Numbers of eREGs included in each group are the same asthose in a case in which an eCCE includes four eREGs. Indexes of eREGsof eCCE 0 in eight PRB pairs are ((eREG 0, eREG 4, eREG 8, and eREG 12),and (eREG 2, eREG 6, eREG 10, and eREG 14)). A first group is (eREG 0,eREG 4, eREG 8, and eREG 12), and a second group is (eREG 2, eREG 6,eREG 10, and eREG 14). Therefore, eCCE 0 is respectively mapped to eightPRB pairs according to a sequence of ((eREG 0, eREG 4, eREG 8, and eREG12), and (eREG 2, eREG 6, eREG 10, and eREG 14)), and a group mappingsequence of eCCE 0 is (first group, and second group). Therefore,numbers of eREGs included in seven eCCEs are the same as those of eCCE0; however, cyclic shifts of the seven eCCEs are not sequential cyclicshifts, and may first be inter-group shifts, and then intra-group cyclicshifts. For example, for eCCE 9 in Table 2, (second group, and firstgroup) is a cyclic shift of the group mapping sequence (first group, andsecond group) of eCCE 0, namely, (second group (6, 10, 14, and 2), andfirst group (4, 8, 12, and 0)). Then, for a sequence of eREGs of eCCE 9in the first group, there is a cyclic shift relative to a sequence ofeREGs of eCCE 0 in the first group, and for a sequence of eREGs in thesecond group, there is a cyclic shift relative to a sequence of eREGs ofeCCE 0 in the second group. Alternatively, there is no inter-group cycleshift, and there is only an intra-group cyclic shift. For example, foreCCE 1, there is no inter-group shift relative to eCCE 0, and there isonly an intra-group shift. Specific numbering manners of eCCEs may bethe manners in Table 1.1 and Table 8.1. In eight eCCEs including sameeREG indexes, three eCCEs have no inter-group shift relative to amapping relationship of eREGs of one eCCE, and have only an intra-groupshift; the other four eCCEs have both an intra-group shift and aninter-group shift. Effect is that a mapping manner of four eREGsincluded in one eCCE may be reused in each group, and implementation issimple.

TABLE 1.1 Manner 1 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes eight eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 1 4 5 8 912 13 2 PRB pair 1 1 4 5 8 9 12 13 0 3 PRB pair 2 4 5 8 9 12 13 0 1 6PRB pair 3 5 8 9 12 13 0 1 4 7 PRB pair 4 8 9 12 13 0 1 4 5 10 PRB pair5 9 12 13 0 1 4 5 8 11 PRB pair 6 12 13 0 1 4 5 8 9 14 PRB pair 7 13 0 14 5 8 9 12 15 ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13 ECCE14 ECCE15PRB pair 0 3 6 7 10 11 14 15 PRB pair 1 6 7 10 11 14 15 2 PRB pair 2 710 11 14 15 2 3 PRB pair 3 10 11 14 15 2 3 6 PRB pair 4 11 14 15 2 3 6 7PRB pair 5 14 15 2 3 6 7 10 PRB pair 6 15 2 3 6 7 10 11 PRB pair 7 2 3 67 10 11 14

TABLE 2.1 Manner 1 of mapping between distributed eCCEs and eREGs, wherethere are four PRB pairs, and each eCCE includes four eREGs ECCE indexECCE0 ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 4 812 1 5 9 13 2 PRB pair 1 4 8 12 0 5 9 13 1 6 PRB pair 2 8 12 0 4 9 13 15 10 PRB pair 3 12 0 4 8 13 1 5 9 14 ECCE index ECCE9 ECCE10 ECCE11ECCE12 ECCE13 ECCE14 ECCE15 PRB pair 0 6 10 14 3 7 11 15 PRB pair 1 1014 2 7 11 15 3 PRB pair 2 14 2 6 11 15 3 7 PRB pair 3 2 6 10 15 3 7 11

TABLE 3.1 Manner 2 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes eight eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 4 8 12 1 59 13 2 PRB pair 1 4 8 12 0 5 9 13 1 6 PRB pair 2 8 12 0 4 9 13 1 5 10PRB pair 3 12 0 4 8 13 1 5 9 14 PRB pair 4 2 6 10 14 3 7 11 15 0 PRBpair 5 6 10 14 2 7 11 15 3 4 PRB pair 6 10 14 2 6 11 15 3 7 8 PRB pair 714 2 6 10 15 3 7 11 12 ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13ECCE14 ECCE15 PRB pair 0 6 10 14 3 7 11 15 PRB pair 1 10 14 2 7 11 15 3PRB pair 2 14 2 6 11 15 3 7 PRB pair 3 2 6 10 15 3 7 11 PRB pair 4 4 812 1 5 9 13 PRB pair 5 8 12 0 5 9 13 1 PRB pair 6 12 0 4 9 13 1 5 PRBpair 7 0 4 8 13 1 5 9

If a control channel resource set includes eight PRB pairs, and eacheCCE includes eight eREGs, for a mapping relationship between eCCEs andeREGs in the eight PRBs pair, a mapping manner used in the first fourPRBs is the same as that in the case described in Table 2.1 in which acontrol channel set includes four PRB pairs and each eCCE includes foureREGs. It may be seen that the first four rows in Table 2.1 arecompletely the same as those in Table 2.1.

However, in the last four rows, that is, in the last four PRB pairs (PRBpair 4, PRB pair 5, PRB pair 6, and PRB pair 7), a mapping relationshipbetween eCCEs and eREGs is a cyclic shift of a mapping relationshipbetween eCCEs and eREGs in the first four PRB pairs, for example, acyclic shift by eight positions. Therefore, the first four eREGs of eCCE8 to eCCE 15 in the first four PRB pairs are cyclically shifted by eightpositions, to change to the last four eREGs of eCCE 0 to eCCE 7.Therefore, the first four eREGs of eCCE 0 to eCCE 7 in the first fourPRB pairs are cyclically shifted by eight positions, to change to thelast four eREGs of eCCE 8 to eCCE 15.

Alternatively

TABLE 4.1 Manner 3 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes eight eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 4 8 12 1 59 13 2 PRB pair 1 4 8 12 0 5 9 13 1 6 PRB pair 2 8 12 0 4 9 13 1 5 10PRB pair 3 12 0 4 8 13 1 5 9 14 PRB pair 4 1 5 9 13 2 6 10 14 3 PRB pair5 5 9 13 1 6 10 14 2 7 PRB pair 6 9 13 1 5 10 14 2 6 11 PRB pair 7 13 15 9 14 2 6 10 15 ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13 ECCE14ECCE15 PRB pair 0 6 10 14 3 7 11 15 PRB pair 1 10 14 2 7 11 15 3 PRBpair 2 14 2 6 11 15 3 7 PRB pair 3 2 6 10 15 3 7 11 PRB pair 4 7 11 15 04 8 12 PRB pair 5 11 15 3 4 8 12 0 PRB pair 6 15 3 7 8 12 0 4 PRB pair 73 7 11 12 0 4 8

If a control channel resource set includes eight PRB pairs, and eacheCCE includes eight eREGs, for a mapping relationship between eCCEs andeREGs in the eight PRBs, a mapping manner used in the first four PRBs isthe same as that in the case described in Table 1 in which a controlchannel set includes four PRB pairs and each eCCE includes four eREGs.It may be seen that the first four rows in Table 4.1 are completely thesame as those in Table 2.1.

However, in the last four rows, that is, in the last four PRB pairs (PRBpair 4, PRB pair 5, PRB pair 6, and PRB pair 7), a mapping relationshipbetween eCCEs and eREGs is a cyclic shift of a mapping relationshipbetween eCCEs and eREGs in the first four PRB pairs, for example, acyclic shift by four positions. Therefore, the first four eREGs in eCCE(i, j−4) are the same as those in Table 2.1, and numbers of the lastfour eREGs are the same as numbers of eREGs corresponding to eCCE (i+4,j−4), where i is a number of an eCCE, and j is an integer from 0 to 3and indicates a jth eREG included in the eCCE.

TABLE 5.1 Manner 1-1 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes four eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 4 8 12 1 59 13 PRB pair 1 4 8 12 0 5 9 13 1 PRB pair 2 8 12 0 4 9 13 1 5 PRB pair3 12 0 4 8 13 1 5 9 PRB pair 4 0 PRB pair 5 4 PRB pair 6 8 PRB pair 7 12ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13 ECCE14 ECCE15 PRB pair 0PRB pair 1 PRB pair 2 PRB pair 3 PRB pair 4 4 8 12 1 5 9 13 PRB pair 5 812 0 5 9 13 1 PRB pair 6 12 0 4 9 13 1 5 PRB pair 7 0 4 8 13 1 5 9

In a case in which each control channel resource set includes eight PRBpairs and each eCCE includes four eREGs, as shown in Table 5.1,

a mapping manner used between eCCEs and eREGs of the first four PRBs isa mapping manner between eCCEs and eREGs in Table 2.1, and a mappingmanner used between eCCEs and eREGs of the last four PRBs is a mappingmanner of eCCE 8 to eCCE 15 in Table 2.1.

TABLE 6.1 Manner 1-2 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes four eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 8 1 9 0 PRBpair 1 4 12 5 13 4 PRB pair 2 8 0 9 1 8 PRB pair 3 12 4 13 5 12 PRB pair4 4 4 5 13 PRB pair 5 8 8 9 1 PRB pair 6 12 12 13 5 PRB pair 7 0 0 1 9ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13 ECCE14 ECCE15 PRB pair 0 81 9 PRB pair 1 12 5 13 PRB pair 2 0 9 1 PRB pair 3 4 13 5 PRB pair 4 4 45 13 PRB pair 5 8 8 9 1 PRB pair 6 12 12 13 5 PRB pair 7 0 0 1 9

In a case in which each control channel resource set includes eight PRBpairs and each eCCE includes four eREGs, as shown in Table 6.1, amapping manner used between eCCEs and eREGs of the first four PRBs is amapping manner of eCCEs having even numbers in Table 2.1, and a mappingmanner used between eCCEs and eREGs of the last four PRBs is a mappingmanner of eCCEs having odd numbers in Table 2.1, or the odd numbers areinterchanged.

TABLE 7.1 Manner of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes eight eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE0 ECCE1 ECCE2 ECCE3 PRB pair 0 0 4 8 12 1 5 9 13PRB pair 1 4 8 12 0 5 9 13 1 PRB pair 2 8 12 0 4 9 13 1 5 PRB pair 3 120 4 8 13 1 5 9 ECCE index ECCE4 ECCE5 ECCE6 ECCE7 ECCE4 ECCE5 ECCE6ECCE7 PRB pair 0 2 6 10 14 3 7 11 15 PRB pair 1 6 10 14 2 7 11 15 3 PRBpair 2 10 14 2 6 11 15 3 7 PRB pair 3 14 2 6 10 15 3 7 11

TABLE 8.1 Manner 2-1 of mapping between eCCEs and eREGs, where there areeight PRB pairs, and each eCCE includes eight eREGs ECCE index ECCE0ECCE1 ECCE2 ECCE3 ECCE4 ECCE5 ECCE6 ECCE7 ECCE8 PRB pair 0 0 1 2 3 4 5 67 8 PRB pair 1 4 5 6 7 8 9 10 11 12 PRB pair 2 8 9 10 11 12 13 14 15 0PRB pair 3 12 13 14 15 0 1 2 3 4 PRB pair 4 1 0 3 2 5 4 7 6 9 PRB pair 56 4 7 6 9 8 11 10 13 PRB pair 6 9 8 11 10 13 12 15 14 1 PRB pair 7 13 1215 14 1 0 3 2 5 ECCE index ECCE9 ECCE10 ECCE11 ECCE12 ECCE13 ECCE14ECCE15 PRB pair 0 9 10 11 12 13 14 15 PRB pair 1 13 14 15 0 1 2 3 PRBpair 2 1 2 3 4 5 6 7 PRB pair 3 5 6 7 8 9 10 11 PRB pair 4 8 11 10 13 1215 14 PRB pair 5 12 15 14 1 0 3 2 PRB pair 6 0 3 2 5 4 7 6 PRB pair 7 47 6 9 8 11 10

FIG. 5 is a schematic structural diagram of an E-PDCCH transmissionapparatus according to an embodiment of the present invention. Theapparatus may be a base station, or may be a user equipment. As shown inFIG. 5, the E-PDCCH transmission apparatus in this embodiment includesan arranging unit 51, a numbering unit 53, a fifth determining unit 52,and a transmission unit 54.

The arranging unit 51 is configured to separately arrange, in a physicalresource block set, first resource groups in each physical resourceblock pair PRB pair, where the first resource groups are resourceelement groups eREGs or REGs, and the physical resource block setincludes at least one of the physical resource block pairs.

The numbering unit 53 is configured to number second resource groupsaccording to a correspondence between the first resource groups and thesecond resource groups in the physical resource block set, where thesecond resource groups are control channel element eCCE groups orcontrol channel candidates.

The fifth determining unit 52 is configured to determine numbers of thesecond resource groups for transmitting an E-PDCCH.

The transmission unit 54 is configured to map, according to thedetermined numbers, the E-PDCCH to the corresponding first resourcegroups for transmission.

Preferably, each of the physical resource block pairs includes N thirdresource groups, where N is a positive integer, and each of the thirdresource groups includes M first resource groups, and in the physicalresource block set, a number set of first resource groups included ineach third resource group in a physical resource block pair is the sameas a number set of first resource groups included in a third resourcegroup in each of other physical resource block pairs, and each of thethird resource groups corresponds to one of second resource groups of afirst type; and the numbering unit 53 is configured to sequentiallynumber the second resource groups of the first type in each physicalresource block pair in ascending or descending order of numbers of thephysical resource block pairs, where a correspondence between numbers ofthe second resource groups of the first type and numbers of firstresource groups corresponding to the second resource groups of the firsttype exists in each physical resource block pair.

Optionally, that a correspondence between numbers of the second resourcegroups of the first type and numbers of first resource groupscorresponding to the second resource groups of the first type exists ineach physical resource block pair includes that: in each physicalresource block pair, the numbers of the second resource groups of thefirst type are consecutive, and a sequence of the numbers of the secondresource groups of the first type is the same as a sequence of maximumnumbers or minimum numbers of the first resource groups corresponding tothe second resource groups of the first type.

Optionally, the numbering unit 53 is configured to determine the numbersof the second resource groups of the first type according to thefollowing formula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

Preferably, each of the physical resource block pairs includes N thirdresource groups, where N is a positive integer, and each of the thirdresource groups includes M first resource groups; in the physicalresource block set, a number set of first resource groups included ineach third resource group in a physical resource block pair is the sameas a number set of first resource groups included in a third resourcegroup in each of other physical resource block pairs; in each of thephysical resource block pairs, a sequence of numbers of the thirdresource groups is the same as a sequence of maximum numbers or minimumnumbers of the first resource groups in the third resource groups; eachof the third resource groups corresponds to one of second resourcegroups of a first type; and the numbering unit 53 is configured tosequentially number the second resource groups of the first typecorresponding to third resource groups having a same number in ascendingor descending order of the numbers of the third resource groups, where acorrespondence between a sequence of numbers of the second resourcegroups of the first type and a sequence of numbers of physical resourceblock pairs in which the second resource groups of the first type arelocated, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number.

Optionally, that a correspondence between a sequence of numbers of thesecond resource groups of the first type and a sequence of numbers ofphysical resource block pairs in which the second resource groups of thefirst type are located, exists in the second resource groups of thefirst type corresponding to the third resource groups having the samenumber includes that: in the second resource groups of the first typecorresponding to the third resource groups having the same number, thenumbers of the second resource groups of the first type are consecutive,and the sequence of the numbers of the second resource groups of thefirst type is the same as the sequence of the numbers of the physicalresource block pairs in which the second resource groups of the firsttype are located.

Preferably, the numbering unit 53 is configured to determine the numbersof the second resource groups of the first type according to thefollowing formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

Preferably, for the second resource groups of the first typecorresponding to the third resource groups having the same number, amapping relationship between the second resource groups of the firsttype in a physical resource block pair and first resource groupsincluded in the second resource groups of the first type in the physicalresource block pair is a cyclic shift of a mapping relationship betweenone of the second resource groups of the first type in each of the otherphysical resource block pairs and first resource groups included in theone of the second resource groups of the first type in each of the otherphysical resource block pairs.

Optionally, the second resource groups of a second type include M firstresource groups that respectively belong to different physical resourceblock pairs; and the numbering unit 53 is configured to use numbers offirst resource groups in a same physical resource block paircorresponding to the second resource groups of the second type asnumbers of the second resource groups of the second type.

Preferably, the numbering unit 53 is configured to determine the numbersof the second resource groups of the second type according to thefollowing formula:J=(I−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

the numbering unit 53 is configured to determine the numbers of thesecond resource groups of the second type according to the followingformula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

Preferably, the second resource groups of a second type include M firstresource groups that respectively belong to different physical resourceblock pairs, and the physical resource block set includes K sets of thesecond resource groups of the second type, where K is a positiveinteger, and in each set of the K sets, a mapping relationship betweenone of the second resource groups of the second type and first resourcegroups included in the one of the second resource groups of the secondtype is a cyclic shift of a mapping relationship between each of othersecond resource groups of the second type and first resource groupsincluded in each of the other second resource groups of the second type;the numbering unit 53 is configured to number, in each set of the Ksets, the second resource groups of the second type according to numbersof first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type; andbetween different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same physicalresource block pair.

Optionally, the physical resource set includes K sets of the secondresource groups of the second type, and in each set of the K sets, amapping relationship between one of the second resource groups of thesecond type and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type.

Preferably, if first resource groups corresponding to at least two ofthe second resource groups of the first type in the physical resourceblock set are the same as first resource groups corresponding to atleast two of the second resource groups of the second type in thephysical resource block set, a set of numbers of the at least two of thesecond resource groups of the first type is the same as a set of numbersof the at least two of the second resource groups of the second type.

Preferably, the second resource groups of the first type in the physicalresource block set are resource groups for transmitting the E-PDCCH inlocalized mode; and the second resource groups of the second type in thephysical resource block set are resource groups for transmitting theE-PDCCH in distributed mode.

The transmission apparatus in this embodiment implements numbering ofthe second resource groups of the first type and the second resourcegroups of the second type, and thereby implements E-PDCCH transmissionand is advantageous for blind detection.

FIG. 6 is a schematic structural diagram of an E-PDCCH transmissionapparatus according to another embodiment of the present invention. Theapparatus may be a base station, or may be a user equipment. As shown inFIG. 6, the apparatus in this embodiment includes at least one processor61 and a transceiver 62, where the transceiver 62 is configured totransmit and receive a signal, and the processor 61 is configured toexecute the following steps:

in a physical resource block set, separately arranging first resourcegroups in each physical resource block pair PRB pair, where the firstresource groups are resource element groups eREGs or REGs, and thephysical resource block set includes at least one of the physicalresource block pairs;

numbering second resource groups according to a correspondence betweenthe first resource groups and the second resource groups in the physicalresource block set, where the second resource groups are control channelelement eCCE groups or control channel candidates;

determining numbers of the second resource groups for transmitting anE-PDCCH; and

mapping, according to the determined numbers, the E-PDCCH to thecorresponding first resource groups for transmission.

Preferably, each of the physical resource block pairs includes N thirdresource groups, where N is a positive integer, and each of the thirdresource groups includes M first resource groups, and in the physicalresource block set, a number set of first resource groups included ineach third resource group in a physical resource block pair is the sameas a number set of first resource groups included in a third resourcegroup in each of other physical resource block pairs; and the processor61 is configured to implement, in the following manner, the numberingsecond resource groups according to a correspondence between the firstresource groups and second resource groups in the physical resourceblock set: each of the third resource groups corresponds to one ofsecond resource groups of a first type, and the second resource groupsof the first type in each physical resource block pair are numberedsequentially in ascending or descending order of numbers of the physicalresource block pairs, where a correspondence between numbers of thesecond resource groups of the first type and numbers of first resourcegroups corresponding to the second resource groups of the first typeexists in each physical resource block pair.

Preferably, that a correspondence between numbers of the second resourcegroups of the first type and numbers of first resource groupscorresponding to the second resource groups of the first type exists ineach physical resource block pair includes that: in each physicalresource block pair, the numbers of the second resource groups of thefirst type are consecutive, and a sequence of the numbers of the secondresource groups of the first type is the same as a sequence of maximumnumbers or minimum numbers of the first resource groups corresponding tothe second resource groups of the first type.

Optionally, the processor 61 is configured to implement, in thefollowing manner, the numbering second resource groups according to acorrespondence between the first resource groups and second resourcegroups in the physical resource block set:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=K*m+(i mod K),

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

Preferably, each of the physical resource block pairs includes N thirdresource groups, where N is a positive integer, and each of the thirdresource groups includes M first resource groups; in the physicalresource block set, a number set of first resource groups included ineach third resource group in a physical resource block pair is the sameas a number set of first resource groups included in a third resourcegroup in each of other physical resource block pairs; in each of thephysical resource block pairs, a sequence of numbers of the thirdresource groups is the same as a sequence of maximum numbers or minimumnumbers of the first resource groups in the third resource groups; andthe processor 61 is configured to implement, in the following manner,the numbering second resource groups according to a correspondencebetween the first resource groups and the second resource groups in thephysical resource block set: each of the third resource groupscorresponds to one of second resource groups of a first type, and thesecond resource groups of the first type corresponding to third resourcegroups having a same number are numbered sequentially in ascending ordescending order of the numbers of the third resource groups, where acorrespondence between a sequence of numbers of the second resourcegroups of the first type and a sequence of numbers of physical resourceblock pairs in which the second resource groups of the first type arelocated, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number.

Optionally, that a correspondence between a sequence of numbers of thesecond resource groups of the first type and a sequence of numbers ofphysical resource block pairs in which the second resource groups of thefirst type are located, exists in the second resource groups of thefirst type corresponding to the third resource groups having the samenumber, includes that: in the second resource groups of the first typecorresponding to the third resource groups having the same number, thenumbers of the second resource groups of the first type are consecutive,and the sequence of the numbers of the second resource groups of thefirst type is the same as the sequence of the numbers of the physicalresource block pairs in which the second resource groups of the firsttype are located.

Preferably, the processor 61 is configured to implement, in thefollowing manner, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set:

determining the numbers of the second resource groups of the first typeaccording to the following formula:j=(i mod K)*K+m,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thefirst type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the first type in each of thephysical resource block pairs, mod indicates a modulo operation, and thesecond resource groups of the first type correspond to M first resourcegroups that belong to a same physical resource block pair, where M is apositive integer.

Preferably, for the second resource groups of the first typecorresponding to the third resource groups having the same number, amapping relationship between the second resource groups of the firsttype in a physical resource block pair and first resource groupsincluded in the second resource groups of the first type in the physicalresource block pair is a cyclic shift of a mapping relationship betweenone of the second resource groups of the first type in each of the otherphysical resource block pairs and first resource groups included in theone of the second resource groups of the first type in each of the otherphysical resource block pairs.

Optionally, the processor 61 is configured to implement, in thefollowing manner, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set: the second resource groups ofa second type include M first resource groups that respectively belongto different physical resource block pairs; and numbers of firstresource groups in a same physical resource block pair corresponding tothe second resource groups of the second type are used as numbers of thesecond resource groups of the second type.

Preferably, the processor 61 is configured to implement, in thefollowing manner, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set:

determining the numbers of the second resource groups of the second typeaccording to the following formula:j=(i−K*m)mod16,

where, i is a number of a first resource group, i is an integer from 0to L−1, L is a quantity of first resource groups in one of the physicalresource block pairs, j is a number of the second resource group of thesecond type, m is a number of a physical resource block pair, K is aquantity of the second resource groups of the second type in each of thephysical resource block pairs, and mod indicates a modulo operation; or

determining the numbers of the second resource groups of the second typeaccording to the following formula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C,

where, i is a number of an x^(th) first resource group corresponding tothe second resource group numbered j of the second type, i is an integerfrom 0 to L−1, L is a quantity of first resource groups in one of thephysical resource block pairs, m is a number of a physical resourceblock pair in which the x^(th) first resource group corresponding to thesecond resource group numbered j of the second type is located,K=floor(P/O), P is a quantity of first resource groups in a physicalresource block pair, O is a quantity of first resource groups includedin a second resource group, C is a quantity of physical resource blockpairs in the physical resource block set, mod indicates a modulooperation, and floor indicates a round-down operation.

Optionally, the processor 61 is configured to implement, in thefollowing manner, the numbering second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set: the second resource groups ofa second type include M first resource groups that respectively belongto different physical resource block pairs, and the physical resourceblock set includes K sets of the second resource groups of the secondtype, where K is a positive integer, and in each set of the K sets, amapping relationship between one of the second resource groups of thesecond type and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type; in each set of the K sets, thesecond resource groups of the second type are numbered according tonumbers of first resource groups in a same physical resource block paircorresponding to the second resource groups of the second type; andbetween different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same physicalresource block pair.

Preferably, the physical resource set includes K sets of the secondresource groups of the second type, and in each set of the K sets, amapping relationship between one of the second resource groups of thesecond type and first resource groups included in the one of the secondresource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups included in each of the other secondresource groups of the second type.

Optionally, if first resource groups corresponding to at least two ofthe second resource groups of the first type in the physical resourceblock set are the same as first resource groups corresponding to atleast two of the second resource groups of the second type in thephysical resource block set, a set of numbers of the at least two of thesecond resource groups of the first type is the same as a set of numbersof the at least two of the second resource groups of the second type.

Optionally, the second resource groups of the first type in the physicalresource block set are resource groups for transmitting the E-PDCCH inlocalized mode; and the second resource groups of the second type in thephysical resource block set are resource groups for transmitting theE-PDCCH in distributed mode.

The apparatus provided by this embodiment implements numbering of thesecond resource groups of the first type and the second resource groupsof the second type, and thereby implements E-PDCCH transmission and isadvantageous for blind detection.

Each localized control channel candidate is preferably centralized incontiguous PRB pairs, but different localized control channel candidatesshould be decentralized as much as possible, so that a scheduling gainand a beam forming gain of a localized control channel may be obtained.Each control channel candidate at an aggregation level of 1, 2, or 4 maybe transmitted in one PRB pair, and therefore, N distributed PRB pairsmay be configured as search scopes of the aggregation level of 1, 2, or4. However, for control channel candidates at an aggregation level of 8,if the foregoing configured search scopes are also used for each controlchannel candidate, the control channel candidates are decentralized indifferent PRB pairs for transmission, and no scheduling gain can beobtained. In view of this problem, the following embodiments of thepresent invention provide a control channel detection method and acontrol channel sending method. Different control channels aredistinguished, different control channels are transmitted by usingdifferent physical resource block sets, and a search scope may beimplicitly defined for a control channel candidate transmitted in morethan one PRB pair may be supported. Thereby, resources may be configuredmore flexibly, control signaling is saved, and it may be ensured thatbetter channel estimation performance in a PRG may be obtained for acontrol channel candidate in more than one PRB pair.

FIG. 7A is a flowchart of a control channel detection method accordingto an embodiment of the present invention. As shown in FIG. 7A, themethod in this embodiment includes:

Step 701: A user equipment UE detects a control channel of a first typein a first physical resource block set, where the first physicalresource block set includes at least one physical resource block pair.

Step 702: The UE detects a control channel of a second type in a secondphysical resource block set, where the second physical resource blockset includes at least one physical resource block pair.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode; and the control channel of the second type is a control channeltransmitted in distributed mode.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel that is transmitted inlocalized mode and whose aggregation level is lower than or equal to apreset aggregation threshold; and the control channel of the second typeis a control channel that is transmitted in localized mode and whoseaggregation level is higher than the preset aggregation threshold.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode, and the control channel candidate of the first type is transmittedin one physical resource block pair; and the control channel of thesecond type is a control channel transmitted in localized mode, and thecontrol channel candidate of the second type is transmitted in at leasttwo physical resource block pairs.

Further, optionally, the control channel candidate of the second typecorresponds to at least two physical resource block pairs, and the atleast two physical resource block pairs corresponding to the controlchannel candidate of the second type are located in a same precodingresource block group (Precoding resource block group, PRG for short) ora same resource block group (Resource Block Group, RBG for short) or asame subband, so that channel estimation performance and demodulationperformance may be improved.

In an optional implementation manner of this embodiment, at least onephysical resource block pair included in the first physical resourceblock set is located in different precoding block groups PRGs orresource block groups RBGs or subbands.

In an optional implementation manner of this embodiment, before the UEdetects the control channel of the first type in the first physicalresource block set, the method includes: receiving, by the UE, firsthigher layer signaling, where the first higher layer signaling includesthe first resource block set. That is, the first physical resource blockset may be configured by a higher layer on a network side, andspecifically, may be configured by using static signaling or dynamicsignaling. This manner may improve flexibility of configuring the firstresource block set.

FIG. 7B shows a first physical resource block set configured by thenetwork side for a control channel. The first physical resource blockset, for example, includes four PRB pairs. The configuration manner maybe a manner of configuring four consecutive VRBs, or may be a resourceallocation manner 1. The four configured PRB pairs are PRB pair 0, PRBpair 4, PRB pair 12, and PRB pair 17 in FIG. 7B.

The control channel candidate transmitted in localized mode may betransmitted in at least one PRB pair. For example, a search scope of thecontrol channel candidate that is transmitted in localized mode andwhose aggregation level is 1, 2, or 4 is at least one PRB pair in thefirst physical resource block set, and each control channel candidate istransmitted in only one PRB pair in the first physical resource blockset. The control channel candidate that is transmitted in localized modeand whose aggregation level is 8 needs to be transmitted in two PRBpairs. Therefore, each control channel candidate is limited to two PRBpairs in one PRG or one RBG or one subband for transmission. One PRBpair of the two PRB pairs comes from the first physical resource blockset, and the other PRB pair comes from the second physical resourceblock set. When the control channel candidate transmitted in localizedmode needs to be transmitted in two PRB pairs, a manner shown in FIG. 7Cmay be used. In FIG. 7C, dotted boxes constitute the first physicalresource block set, and gray boxes constitute the second physicalresource block set.

Optionally, the second physical resource block set and the firstphysical resource block set may use an implicit correspondence, and mayalso be configured for the UE by using higher layer signaling. Animplicit correspondence is that: in the first physical resource blockset, each PRB pair belongs to different PRGs or RBGs or subbands, andtherefore, one PRB pair associated with a PRB pair of the first physicalresource block set is implicitly predefined in each RPG or RBG orsubband, and used as a PRB pair of the second physical resource blockset. For example, an association manner may be that a distance betweenthe PRB pair of the second physical resource block set and the PRB pairof the first physical resource block set in one PRG or RBG or subband isa cyclic difference of at least one PRB pair. As shown in FIG. 7C, inPRG 1, a position index of the PRB pair in the first physical resourceblock set is 0, and a position index of the PRB pair in the secondphysical resource block set is 1; in PRG 2, a position index of the PRBpair in the first physical resource block set is 4, and a position indexof the PRB pair in the second physical resource block set is 5; in PRG5, a position index of the PRB pair in the first physical resource blockset is 12, and a position index of the PRB pair in the second physicalresource block set is 13; in PRG 6, a position index of the PRB pair inthe first physical resource block set is 17, and a position index of thePRB pair in the second physical resource block set is 15. This implicitcorrespondence may enable a base station to send the first physicalresource block set by using only higher layer signaling, and isadvantageous for reducing signaling notifications.

In an optional implementation manner of this embodiment, the secondphysical resource block set includes the first physical resource blockset and a third physical resource block set. As shown in FIG. 7C, dottedboxes and gray boxes constitute the second physical resource block set,where the dotted boxes constitute the first physical resource block set,and the padded boxes constitute the third physical resource block set.

On a basis of the foregoing description, one physical resource blockpair of the at least two physical resource block pairs corresponding tothe control channel candidate of the second type is a physical resourceblock pair of the first physical resource block set, and at least onephysical resource block pair of the remaining physical resource blockpairs is a physical resource block pair of the third physical resourceblock set.

In an optional implementation manner of this embodiment, before the UEdetects the control channel of the second type in the second physicalresource block set, the method includes: obtaining, by the UE, the thirdresource block set according to the first resource block set and apreset function mapping relationship, which may reduce signalingnotifications, so that a manner of configuring control channel resourcesis more flexible. Alternatively, the UE receives second higher layersignaling, where the second higher layer signaling includes the thirdresource block set. That is, the third physical resource block set maybe configured by a higher layer on the network side, and may beconfigured by using higher layer static signaling or dynamic signaling.This manner is advantageous for improving flexibility of configuring thethird physical resource block set.

By using the control channel detection method provided by thisembodiment, control channels may be classified into different types, anddetection and reception of control channels of different types arecompleted. In addition, during transmission in localized mode, thisembodiment may limit a control channel candidate used for transmissionto one PRG or RBG or subband, which may improve channel estimationperformance and demodulation performance.

An embodiment of the present invention provides a control channelsending method. An entity for executing the method is a base station.The method specifically includes: determining, by a base station, a typeof a control channel to be sent; if it is determined that the controlchannel is a control channel of a first type, sending, by the basestation, the control channel in a first physical resource block set; andif it is determined that the control channel is a control channel of asecond type, sending, by the base station, the control channel in asecond physical resource block set, where the first physical resourceblock set includes at least one physical resource block pair, and thesecond physical resource block set includes at least one physicalresource block pair.

Specifically, if the control channel of the first type is to be sent,the base station sends the control channel of the first type in thefirst physical resource block set, and if the control channel of thesecond type is to be sent, the base station sends the control channel ofthe second type in the second physical resource block set.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode; and the control channel of the second type is a control channeltransmitted in distributed mode.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel that is transmitted inlocalized mode and whose aggregation level is lower than or equal to apreset aggregation threshold; and the control channel of the second typeis a control channel that is transmitted in localized mode and whoseaggregation level is higher than the preset aggregation threshold.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode, and the control channel candidate of the first type is transmittedin one physical resource block pair; and the control channel of thesecond type is a control channel transmitted in localized mode, and thecontrol channel candidate of the second type is transmitted in at leasttwo physical resource block pairs.

Further, optionally, the control channel candidate of the second typecorresponds to at least two physical resource block pairs, and the atleast two physical resource block pairs corresponding to the controlchannel candidate of the second type are located in a same PRG or a sameRBG or a same subband, which is advantageous for improving channelestimation performance and demodulation performance.

In an optional implementation manner of this embodiment, at least onephysical resource block pair included in the first physical resourceblock set is located in different precoding block groups PRGs orresource block groups RBGs or subbands.

In an optional implementation manner of this embodiment, before thecontrol channel of the first type is sent in the first physical resourceblock set, the method includes: sending, by the base station, firsthigher layer signaling, where the first higher layer signaling includesthe first resource block set. That is, the first physical resource blockset may be configured by a higher layer at a network side, andspecifically, may be configured by using static signaling or dynamicsignaling. This manner is advantageous for improving flexibility ofconfiguring the first resource block set.

In an optional implementation manner of this embodiment, the secondphysical resource block set includes the first physical resource blockset and a third physical resource block set.

On a basis of the foregoing description, one physical resource blockpair of the at least two physical resource block pairs corresponding tothe control channel candidate of the second type is a physical resourceblock pair of the first physical resource block set, and at least onephysical resource block pair of the remaining physical resource blockpairs is a physical resource block pair of the third physical resourceblock set.

In an optional implementation manner of this embodiment, before the basestation sends the control channel of the second type in the secondphysical resource block set, the method includes: sending, by the basestation, second higher layer signaling, where the second higher layersignaling includes the third resource block set. That is, the thirdphysical resource block set may be configured by a higher layer at thenetwork side, and may be configured by using higher layer staticsignaling or dynamic signaling. This manner is advantageous forimproving flexibility of configuring the third resource block set.

By using the control channel sending method provided by this embodiment,control channels may be classified into different types, and sending ofcontrol channels of different types is completed. In addition, duringtransmission in localized mode, this embodiment may limit a controlchannel candidate used for transmission to one PRG or RBG or subband,which may improve channel estimation performance and demodulationperformance.

FIG. 8 is a schematic structural diagram of a UE according to stillanother embodiment of the present invention. As shown in FIG. 8, the UEin this embodiment includes a first detecting unit 81 and a seconddetecting unit 82.

The first detecting unit 81 is configured to detect a control channel ofa first type in a first physical resource block set, where the firstphysical resource block set includes at least one physical resourceblock pair.

The second detecting unit 82 is configured to detect a control channelof a second type in a second physical resource block set, where thesecond physical resource block set includes at least one physicalresource block pair.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode; and the control channel of the second type is a control channeltransmitted in distributed mode.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel that is transmitted inlocalized mode and whose aggregation level is lower than or equal to apreset aggregation threshold; and the control channel of the second typeis a control channel that is transmitted in localized mode and whoseaggregation level is higher than the preset aggregation threshold.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode, and the control channel candidate of the first type is transmittedin one physical resource block pair; and the control channel of thesecond type is a control channel transmitted in localized mode, and thecontrol channel candidate of the second type is transmitted in at leasttwo physical resource block pairs.

Further, optionally, the control channel candidate of the second typecorresponds to at least two physical resource block pairs, and the atleast two physical resource block pairs corresponding to the controlchannel candidate of the second type are located in a same PRG or a sameRBG or a same subband.

In an optional implementation manner of this embodiment, at least onephysical resource block pair included in the first physical resourceblock set is located in different precoding block groups PRGs orresource block groups RBGs or subbands, so that channel estimationperformance and demodulation performance may be improved.

In an optional implementation manner of this embodiment, the secondphysical resource block set includes the first physical resource blockset and a third physical resource block set.

On a basis of the foregoing description, one physical resource blockpair of the at least two physical resource block pairs corresponding tothe control channel candidate of the second type is a physical resourceblock pair of the first physical resource block set, and at least onephysical resource block pair of the remaining physical resource blockpairs is a physical resource block pair of the third physical resourceblock set.

In an optional implementation manner of this embodiment, the UE in thisembodiment further includes a second receiving unit 83. The secondreceiving unit 83 is configured to receive first higher layer signaling,where the first higher layer signaling includes the first resource blockset. The second receiving unit 83 is connected to the first detectingunit 81, and configured to provide the first resource block set for thefirst detecting unit 81.

In an optional implementation manner of this embodiment, the UE in thisembodiment further includes a third obtaining unit 84 and/or a thirdreceiving unit 85.

The third obtaining unit 84 is configured to obtain the third resourceblock set according to the first resource block set and a presetfunction mapping relationship.

The third receiving unit 85 is configured to receive second higher layersignaling, where the second higher layer signaling includes the thirdresource block set. The third obtaining unit 84 and third receiving unit85 are respectively connected to the second detecting unit 82, andconfigured to provide the third resource block set for the seconddetecting unit 82.

The UE provided by this embodiment may be configured to execute theprocedure of the foregoing control channel detection method. Specificoperating principles are not further described. For details, refer tothe description of the method embodiment.

By using the UE provided by this embodiment, detection of controlchannels is completed, and during transmission in localized mode, acontrol channel candidate used for transmission is limited to one PRG orRBG or subband, which improves channel estimation performance anddemodulation performance.

FIG. 9 is a schematic structural diagram of a base station according tostill another embodiment of the present invention. As shown in FIG. 9,the base station in this embodiment includes a determining unit 91 and asecond sending unit 92.

The determining unit 91 is configured to determine a type of a controlchannel to be sent. The second sending unit 92 is configured to send thecontrol channel in a first physical resource block set when thedetermining unit 91 determines that the control channel is a controlchannel of a first type, or send the control channel in a secondphysical resource block set when the determining unit 91 determines thatthe control channel is a control channel of a second type, where thefirst physical resource block set includes at least one physicalresource block pair, and the second physical resource block set includesat least one physical resource block pair.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode; and the control channel of the second type is a control channeltransmitted in distributed mode.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel that is transmitted inlocalized mode and whose aggregation level is lower than or equal to apreset aggregation threshold; and the control channel of the second typeis a control channel that is transmitted in localized mode and whoseaggregation level is higher than the preset aggregation threshold.

In an optional implementation manner of this embodiment, the controlchannel of the first type is a control channel transmitted in localizedmode, and the control channel candidate of the first type is transmittedin one physical resource block pair; and the control channel of thesecond type is a control channel transmitted in localized mode, and thecontrol channel candidate of the second type is transmitted in at leasttwo physical resource block pairs.

Further, optionally, the control channel candidate of the second typecorresponds to at least two physical resource block pairs, and the atleast two physical resource block pairs corresponding to the controlchannel candidate of the second type are located in a same PRG or a sameRBG or a same subband.

In an optional implementation manner of this embodiment, at least onephysical resource block pair included in the first physical resourceblock set is located in different precoding block groups PRGs orresource block groups RBGs or subbands, so that channel estimationperformance and demodulation performance may be improved.

In an optional implementation manner of this embodiment, the secondphysical resource block set includes the first physical resource blockset and a third physical resource block set.

On a basis of the foregoing description, one physical resource blockpair of the at least two physical resource block pairs corresponding tothe control channel candidate of the second type is a physical resourceblock pair of the first physical resource block set, and at least onephysical resource block pair of the remaining physical resource blockpairs is a physical resource block pair of the third physical resourceblock set.

In an optional implementation manner of this embodiment, the secondsending unit 92 is further configured to send first higher layersignaling, where the first higher layer signaling includes the firstresource block set. The second sending unit 92 is specificallyconfigured to send the first higher layer signaling to a UE before thesecond sending unit 92 sends the control channel.

In an optional implementation manner of this embodiment, the secondsending unit 92 is further configured to send second higher layersignaling, where the second higher layer signaling includes the thirdresource block set. The second sending unit 92 is specificallyconfigured to send the second higher layer signaling to a UE before thesecond sending unit 92 sends the control channel.

The base station provided by this embodiment may be configured toexecute the procedure of the foregoing control channel sending method.Specific operating principles are not further described. For details,refer to the description of the method embodiment.

By using the base station provided by this embodiment, control channelsmay be classified into different types, and sending of control channelsof different types is completed. In addition, during transmission inlocalized mode, limiting a control channel candidate used fortransmission to one PRG or RBG or subband is supported, which mayimprove channel estimation performance and demodulation performance.

Still another embodiment of the present invention provides a UE. The UEincludes at least one processor and a memory, where the memory isconfigured to store executable program code, and the processor runs, byreading the executable program code stored in the memory, a programcorresponding to the executable program code so as to:

detect a control channel of a first type in a first physical resourceblock set, where the first physical resource block set includes at leastone physical resource block pair; and

detect a control channel of a second type in a second physical resourceblock set, where the second physical resource block set includes atleast one physical resource block pair.

The UE provided by this embodiment may be configured to execute theprocedure of the foregoing control channel detection method. Specificoperating principles are not further described. For details, refer tothe description of the method embodiment.

By using the UE provided by this embodiment, detection of controlchannels is completed, and during transmission in localized mode, acontrol channel candidate used for transmission is limited to one PRG orRBG or subband, which improves channel estimation performance anddemodulation performance.

Still another embodiment of the present invention provides a basestation. The base station includes a processor and a transmitter.

The processor is configured to determine a type of a control channel tobe sent. The transmitter is configured to send the control channel in afirst physical resource block set when the processor determines that thecontrol channel is a control channel of a first type, or send thecontrol channel in a second physical resource block set when theprocessor determines that the control channel is a control channel of asecond type, where the first physical resource block set includes atleast one physical resource block pair, and the second physical resourceblock set includes at least one physical resource block pair.

The base station provided by this embodiment may be configured toexecute the procedure of the foregoing control channel sending method.Specific operating principles are not further described. For details,refer to the description of the method embodiment.

By using the base station provided by this embodiment, control channelsmay be classified into different types, and sending of control channelsof different types is completed. In addition, during transmission inlocalized mode, limiting a control channel candidate used fortransmission to one PRG or RBG or subband is supported, which mayimprove channel estimation performance and demodulation performance.

A person of ordinary skill in the art may understand that all or a partof the steps of the method embodiments may be implemented by a programinstructing relevant hardware. The program may be stored in a computerreadable storage medium. When the program runs, the steps of the methodembodiments are performed. The foregoing storage medium includes: anymedium that can store program code, such as a ROM, a RAM, a magneticdisk, or an optical disc.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of the presentinvention, but not for limiting the present invention. Although thepresent invention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solutions describedin the foregoing embodiments or make equivalent replacements to some orall technical features thereof, without departing from the scope of thetechnical solutions of the embodiments of the present invention.

What is claimed is:
 1. An enhanced physical downlink control channel(E-PDCCH) transmission method comprising: in a physical resource blockset, separately ordering, by a base station, first resource groups ineach physical resource block (PRB) pair, wherein the first resourcegroups are resource element groups (REGs), and the physical resourceblock set comprises at least one of the physical resource block pairs;numbering, by the base station, second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set, wherein the second resourcegroups are control channel element (eCCE) groups or control channelcandidates; determining, by the base station, numbers of the secondresource groups for transmitting an E-PDCCH; and mapping, by the basestation, according to the determined numbers, the E-PDCCH tocorresponding first resource groups for transmission; transmitting, bythe base station the E-PDCCH to a terminal device, wherein each of theat least one physical resource block pair comprises N third resourcegroups, wherein N is a positive integer, and each of the N thirdresource groups comprises M first resource groups; wherein in thephysical resource block set, a number set of first resource groupscomprised in each third resource group in a physical resource block pairis the same as a number set of first resource groups comprised in athird resource group in each of other physical resource block pairs;wherein in each of the physical resource block pairs, a sequence ofnumbers of the third resource groups is the same as a sequence ofmaximum numbers or minimum numbers of the first resource groups in thethird resource groups; and numbering the second resource groupsaccording to the correspondence between the first resource groups andthe second resource groups in the physical resource block set comprisesnumbering the second resource groups of a first type corresponding tothird resource groups having a same number sequentially in an ascendingor descending order of the numbers of the third resource groups, whereineach of the third resource groups corresponds to one of second resourcegroups of the first type, and a correspondence between a sequence ofnumbers of the second resource groups of the first type and a sequenceof numbers of PRB pairs in which the second resource groups of the firsttype are located, exists in the second resource groups of the first typecorresponding to the third resource groups having the same number. 2.The method according to claim 1, wherein that the correspondence betweenthe sequence of numbers of the second resource groups of the first typeand the sequence of numbers of PRB pairs in which the second resourcegroups of the first type are located, exists in the second resourcegroups of the first type corresponding to the third resource groupshaving the same number comprises that: in the second resource groups ofthe first type corresponding to the third resource groups having thesame number, the numbers of the second resource groups of the first typeare consecutive, and the sequence of the numbers of the second resourcegroups of the first type is the same as the sequence of the numbers ofthe PRB pairs in which the second resource groups of the first type arelocated.
 3. The method according to claim 1, wherein numbering thesecond resource groups according to the correspondence between the firstresource groups and the second resource groups in the physical resourceblock set comprises: determining the numbers of the second resourcegroups of the first type according to the following formula:j=(i mod K)*K+m, wherein, i is a number of a first resource group, i isan integer from 0 to L−1, L is a quantity of first resource groups inone of the PRB pairs, j is a number of the second resource group of thefirst type, m is a number of a PRB pair, K is a quantity of the secondresource groups of the first type in each of the PRB pairs, modindicates a modulo operation, and the second resource groups of thefirst type correspond to M first resource groups that belong to a samePRB pair, wherein M is a positive integer.
 4. The method according toclaim 1, wherein: for the second resource groups of the first typecorresponding to the third resource groups having the same number, amapping relationship between the second resource group of the first typein a PRB pair and first resource groups comprised in the second resourcegroup of the first type in the PRB pair is a cyclic shift of a mappingrelationship between one of the second resource groups of the first typein each of the other PRB pairs and first resource groups comprised inthe one of the second resource groups of the first type in each of theother PRB pairs.
 5. The method according to claim 1, wherein whennumbering the second resource groups according to the correspondencebetween the first resource groups and second resource groups in thephysical resource block set, the second resource groups of a second typecomprise M first resource groups that respectively belong to differentphysical resource block pairs; and numbers of first resource groups in asame PRB pair corresponding to the second resource groups of the secondtype are used as numbers of the second resource groups of the secondtype.
 6. The method according to claim 5, wherein numbering the secondresource groups according to the correspondence between the firstresource groups and the second resource groups in the physical resourceblock set comprises one of the following: (a) determining the numbers ofthe second resource groups of the second type according to the followingformula:j=(i−K*m)mod16, wherein, i is a number of a first resource group, i isan integer from 0 to L−1, L is a quantity of first resource groups inone of the PRB pairs, j is a number of the second resource group of thesecond type, m is a number of a PRB pair, K is a quantity of the secondresource groups of the second type in each of the PRB pairs, and modindicates a modulo operation; and (b) determining the numbers of thesecond resource groups of the second type according to the followingformula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C, wherein, i is a number of an x^(th) firstresource group corresponding to the second resource group numbered j ofthe second type, i is an integer from 0 to L−1, L is a quantity of firstresource groups in one of the PRB pairs, m is a number of a PRB pair inwhich the x^(th) first resource group corresponding to the secondresource group numbered j of the second type is located, K=floor(P/O), Pis a quantity of first resource groups in a PRB pair, O is a quantity offirst resource groups comprised in a second resource group, C is aquantity of PRB pairs in the PRB set, mod indicates a modulo operation,and floor indicates a round-down operation.
 7. The method according toclaim 5, wherein: the physical resource block set comprises K sets ofthe second resource groups of the second type, and in each set of the Ksets, a mapping relationship between one of the second resource groupsof the second type and first resource groups comprised in the one of thesecond resource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups comprised in each of the other secondresource groups of the second type.
 8. The method according to claim 5,wherein: if first resource groups corresponding to at least two of thesecond resource groups of the first type in the PRB set are the same asfirst resource groups corresponding to at least two of the secondresource groups of the second type in the PRB set, a set of numbers ofthe at least two of the second resource groups of the first type is thesame as a set of numbers of the at least two of the second resourcegroups of the second type.
 9. The method according to claim 5, wherein:the second resource groups of the first type in the physical resourceblock set are resource groups for transmitting the E-PDCCH in alocalized mode; and the second resource groups of the second type in thephysical resource block set are resource groups for transmitting theE-PDCCH in a distributed mode.
 10. The method according to claim 1,wherein when numbering the second resource groups according to acorrespondence between the first resource groups and the second resourcegroups in the physical resource block set, the second resource groups ofa second type comprise M first resource groups that respectively belongto different PRB pairs, and the PRB set comprises K sets of the secondresource groups of the second type, wherein K is a positive integer, andin each set of the K sets, a mapping relationship between one of thesecond resource groups of the second type and first resource groupscomprised in the one of the second resource groups of the second type isa cyclic shift of a mapping relationship between each of other secondresource groups of the second type and first resource groups comprisedin each of the other second resource groups of the second type; in eachset of the K sets, the second resource groups of the second type arenumbered according to numbers of first resource groups in a same PRBpair corresponding to the second resource groups of the second type; andbetween different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same PRB pair.11. An enhanced physical downlink control channel (E-PDCCH) transmissionapparatus comprising: a transceiver, configured to transmit and receivea signal; and a processor, configured to: in a physical resource blockset, separately order first resource groups in each physical resourceblock (PRB) pair, wherein the first resource groups are resource elementgroups (REGs), and the physical resource block set comprises at leastone of the physical resource block pairs; number second resource groupsaccording to a correspondence between the first resource groups and thesecond resource groups in the physical resource block set, wherein thesecond resource groups are control channel element (eCCE) groups orcontrol channel candidates; determine numbers of the second resourcegroups for transmitting an E-PDCCH; and map, according to the determinednumbers, the E-PDCCH to corresponding first resource groups fortransmission, wherein each of the physical resource block pairscomprises N third resource groups, wherein N is a positive integer, andeach of the N third resource groups comprises M first resource groups;wherein in the physical resource block set, a number set of firstresource groups comprised in each third resource group in a physicalresource block pair is the same as a number set of first resource groupscomprised in a third resource group in each of other physical resourceblock pairs; wherein in each of the physical resource block pairs, asequence of numbers of the third resource groups is the same as asequence of maximum numbers or minimum numbers of the first resourcegroups in the third resource groups; and the processor is furtherconfigured to number the second resource groups of a first typecorresponding to third resource groups having a same number sequentiallyin an ascending or descending order of the numbers of the third resourcegroups, wherein each of the third resource groups corresponds to one ofsecond resource groups of the first type, and a correspondence between asequence of numbers of the second resource groups of the first type anda sequence of numbers of PRB pairs in which the second resource groupsof the first type are located, exists in the second resource groups ofthe first type corresponding to the third resource groups having thesame number.
 12. The apparatus according to claim 11, wherein that thecorrespondence between the sequence of numbers of the second resourcegroups of the first type and the sequence of numbers of PRB pairs inwhich the second resource groups of the first type are located, existsin the second resource groups of the first type corresponding to thethird resource groups having the same number comprises that: in thesecond resource groups of the first type corresponding to the thirdresource groups having the same number, the numbers of the secondresource groups of the first type are consecutive, and the sequence ofthe numbers of the second resource groups of the first type is the sameas the sequence of the numbers of the PRB pairs in which the secondresource groups of the first type are located.
 13. The apparatusaccording to claim 11, wherein the processor is further configured to:determine the numbers of the second resource groups of the first typeaccording to the following formula:j=(i mod K)*K+m, wherein, i is a number of a first resource group, i isan integer from 0 to L−1, L is a quantity of first resource groups inone of the PRB pairs, j is a number of the second resource group of thefirst type, m is a number of a PRB pair, K is a quantity of the secondresource groups of the first type in each of the PRB pairs, modindicates a modulo operation, and the second resource groups of thefirst type correspond to M first resource groups that belong to a samePRB pair, wherein M is a positive integer.
 14. The apparatus accordingto claim 11, wherein: for the second resource groups of the first typecorresponding to the third resource groups having the same number, amapping relationship between the second resource group of the first typein a PRB pair and first resource groups comprised in the second resourcegroup of the first type in the PRB pair is a cyclic shift of a mappingrelationship between one of the second resource groups of the first typein each of the other PRB pairs and first resource groups comprised inthe one of the second resource groups of the first type in each of theother PRB pairs.
 15. The apparatus according to claim 11, wherein whennumbering the second resource groups according to the correspondencebetween the first resource groups and the second resource groups in thephysical resource block set, the second resource groups of a second typecomprise M first resource groups that respectively belong to differentphysical resource block pairs; and numbers of first resource groups in asame PRB pair corresponding to the second resource groups of the secondtype are used as numbers of the second resource groups of the secondtype.
 16. The apparatus according to claim 15, wherein the processor isfurther configured to implement one of the following: (a) determiningthe numbers of the second resource groups of the second type accordingto the following formula:j=(i−K*m)mod16, wherein, i is a number of a first resource group, i isan integer from 0 to L−1, L is a quantity of first resource groups inone of the PRB pairs, j is a number of the second resource group of thesecond type, m is a number of a PRB pair, K is a quantity of the secondresource groups of the second type in each of the PRB pairs, and modindicates a modulo operation; and (b) determining the numbers of thesecond resource groups of the second type according to the followingformula:i=(j+x*K)mod N,m=(floor(j/(M*K))*M+x)mod C, wherein, i is a number of an x^(th) firstresource group corresponding to the second resource group numbered j ofthe second type, i is an integer from 0 to L−1, L is a quantity of firstresource groups in one of the PRB pairs, m is a number of a PRB pair inwhich the x^(th) first resource group corresponding to the secondresource group numbered j of the second type is located, K=floor(P/O), Pis a quantity of first resource groups in a PRB pair, O is a quantity offirst resource groups comprised in a second resource group, C is aquantity of PRB pairs in the PRB set, mod indicates a modulo operation,and floor indicates a round-down operation.
 17. The apparatus accordingto claim 15, wherein: the physical resource block set comprises K setsof the second resource groups of the second type, and in each set of theK sets, a mapping relationship between one of the second resource groupsof the second type and first resource groups comprised in the one of thesecond resource groups of the second type is a cyclic shift of a mappingrelationship between each of other second resource groups of the secondtype and first resource groups comprised in each of the other secondresource groups of the second type.
 18. The apparatus according to claim15, wherein: if first resource groups corresponding to at least two ofthe second resource groups of the first type in the PRB set are the sameas first resource groups corresponding to at least two of the secondresource groups of the second type in the PRB set, a set of numbers ofthe at least two of the second resource groups of the first type is thesame as a set of numbers of the at least two of the second resourcegroups of the second type.
 19. The apparatus according to claim 15,wherein the second resource groups of the first type in the physicalresource block set are resource groups for transmitting the E-PDCCH in alocalized mode; and the second resource groups of the second type in thephysical resource block set are resource groups for transmitting theE-PDCCH in a distributed mode.
 20. The apparatus according to claim 11,wherein when numbering the second resource groups according to thecorrespondence between the first resource groups and the second resourcegroups in the physical resource block set: the second resource groups ofa second type comprise M first resource groups that respectively belongto different PRB pairs, and the PRB set comprises K sets of the secondresource groups of the second type, wherein K is a positive integer, andin each set of the K sets, a mapping relationship between one of thesecond resource groups of the second type and first resource groupscomprised in the one of the second resource groups of the second type isa cyclic shift of a mapping relationship between each of other secondresource groups of the second type and first resource groups comprisedin each of the other second resource groups of the second type; in eachset of the K sets, the second resource groups of the second type arenumbered according to numbers of first resource groups in a same PRBpair corresponding to the second resource groups of the second type; andbetween different sets of the K sets, a sequence of numbers of thesecond resource groups of the second type is the same as a sequence ofmaximum numbers or minimum numbers of first resource groupscorresponding to the different sets in the K sets in a same PRB pair.